Questions tagged [water-parameters]

The physical and chemical aspects of an aquarium's water that affect the animals living within it. Please provide specific details of what spieces are inhabiting the aquarium and include their respective tags. Common examples of water parameters include pH, temperature, salinity, nitrogen wastes content, general hardness (GH) and carbonate hardness (KH).

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Are there health risks to leaving a dead fish in the aquarium?

Sometimes one fish dies, without any apparent disease. In previous aquariums I would always remove them as fast as I could. Now my aquarium is a bit bigger, and I have some laziness to remove those ...
woliveirajr's user avatar
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24 votes
3 answers
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How can I permanently reduce the pH level of my aquarium?

I have an aquarium with some rocks and substrate mixture, and about 15 small fishes. The pH level of the water is always high (7.6 - 8), away from the recommended value for the fishes I have. I want ...
woliveirajr's user avatar
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17 votes
3 answers
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How does one effectively "cycle" an aquarium?

I have read that prior to putting fish in an aquarium, one must "cycle" the tank so that bacteria that oxidize ammonia will produce nitrite, and nitrite-oxidizing bacteria will make nitrate. ...
Peter Grace's user avatar
15 votes
3 answers
1k views

When is it safe to add fish?

I have a 50-gallon wide tank and all associated materials. On November 1st, my tank had tap water chemistry (meaning 0 ammonia, 0 everything); I had just set up my tank. I added Stress Zyme by API ...
Don Larynx's user avatar
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12 votes
1 answer
317 views

My tap water is contaminated by the chemical (MCHM) leak, what do I use for water changes?

I'm in the 'Do Not Use' zone of West Virginia, so I'm affected by the MCHM CHEMICAL Leak and need to do a partial water change on a freshwater tank. Some of my fish are 16+ years old, and I don't ...
Charlene's user avatar
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10 votes
6 answers
10k views

Can I add soda water to my tank to supply CO₂ for my plants?

I have some plants in my tropical aquarium. They're not doing too well. I suspect I may have a CO2 shortage. Can I add soda water to the tank? I've seen complicated setups for adding CO2 to water. ...
Richard C's user avatar
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10 votes
2 answers
26k views

Why did my ammonia level rise after a water change?

I have the API freshwater kit. I tested for 0.25 ppm ammonia and 40ppm nitrate. After the water change, I have 0.50 ppm ammonia and 5ppm nitrate. WHAT THE HECK? In fact right before I put water in ...
Don Larynx's user avatar
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9 votes
2 answers
3k views

Would a small amount of bottled water mixed in with an aquarium harm the fish?

This is kind of urgent - I'm watching someone's dogs currently because that is what I am experienced in but they also have an aquarium. I have little to know experience with fish and I did warn the ...
fishnewb's user avatar
9 votes
1 answer
9k views

How do I do a water change in my fish tank?

I have seen many questions asking how often one should do a water change for different circumstances in a freshwater aquarium, and so on, which got me wondering. I never knew, until I was on this site,...
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9 votes
1 answer
31k views

Why did my established pond suddenly have a mass death event?

For over 8 years I have had a pond in the corner of my home. It is of a triangular shape, about 10' x12' x15' (3 x 3.6 x 4.5 m) by two feet (60 cm) deep. For ...
Dustin's user avatar
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8 votes
2 answers
549 views

What signs indicate good water quality for tropical fish?

What are the signs of good water quality? I want to add fish to my freshwater aquarium, and I want to make sure they have the least chance of dying.
Don Larynx's user avatar
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8 votes
1 answer
2k views

Why do you need to change the water in your fish tank?

There are several posts here about the right ways and wrong ways to change water in your fish tank, and all the ways it can go wrong. Why do you need to change it? It would seem unlikely that water ...
James Jenkins's user avatar
7 votes
4 answers
26k views

Aquarium water becomes overly acidic very quickly

A few months ago, we took over ownership of a small fish tank (with fish) from their existing owner. They had kept fish for many years without trouble, and told us that they changed the water every 2-...
Bob Tway's user avatar
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6 votes
3 answers
458 views

CO₂ supply with KH 0 - pH effect

I couldn't find anything online so I'm asking the question here. I use distilled water for some species of crabs which should have a carbonate hardness of 0. Now I want to add plants to the aquarium ...
Herrsocke's user avatar
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6 votes
1 answer
3k views

Best way to adjust fish tank water chemistry

I am a new fish owner with 4 tetras and 1 pleco. My tank is 10 gallon (37.8 liters) with an Aqueon QuietFlow LED 20 PRO Aquarium Power Filter The tank has been running for over 3 months and it gets a ...
Marinaio's user avatar
  • 201
6 votes
2 answers
3k views

Axolotl nitrate levels high- more frequent water changes?

I have had a young adult male axolotl (Smaug) for about a year now. Recently when testing water parameters I have found that the nitrate levels are very high (80ppm), but both nitrite and ammonia ...
Eloise Lockyer's user avatar
6 votes
1 answer
10k views

Is there a way to test the amount of dissolved oxygen in a tank?

I normally don't use an aerator for my fish tanks, but I also don't usually have my fish tanks anywhere close to being full of fish. I've set up a new aquarium recently, with the plan to have ...
Spidercat's user avatar
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6 votes
3 answers
470 views

Why do my Betta fish keep dying?

I got my first Betta fish (name: Dream) back in September of 2020, he was the first pet I've ever owned and it took me a little time to be able to get him a proper home. But after educating myself ...
Hailley Husson's user avatar
6 votes
3 answers
117 views

Is the filter change necessary?

My Betta, Neptune, lives in a BiOrb FLOW 30 tank which has a spongy filter material sitting on top of charcoal pellets. I was changing it monthly but got behind and the current filter is going on 3 ...
user avatar
6 votes
2 answers
2k views

Why is my aquarium pH plummeting despite frequent water changes?

This is new. I have a well-established 75 gallon aquarium with six medium-sized blood parrot fish that I've had for years. Suddenly the pH of the water is consistently below what my testing system can ...
Robert Cartaino's user avatar
5 votes
1 answer
393 views

What is special about an aquarium using no carbon dioxide, no fertilizer and no filter?

A random video on Youtube presents itself with the following title: 24th Month – (Carrot Feeding Frenzy) NO filter, NO CO2, NO Ferts 5 Gallon Nano Tank Presumably having no filter, no CO2 and no ...
JonathanReez's user avatar
5 votes
1 answer
4k views

How long to wait before I remove the old filter?

I have recently purchased a sponge filter just like this one. I added it to my tank when it arrived home about a week ago. My tank has been running for over 4 months now. The tank has been stocked for ...
Rémi's user avatar
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4 votes
2 answers
3k views

Why are my ammonia levels still high?

I performed a water change two days ago. My ammonia levels were at 0.25-0.5 ppm right after the water change, which one user suggested was due to the chloramine removers. However, it has been two ...
Don Larynx's user avatar
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4 votes
1 answer
1k views

What are normal pH fluctuations, and what could be causing extreme fluctuations?

I measured my pH last night. One tank was <6.2. Another, >7.4. And the last one was 6.8. This morning, about 12 hours later, they're all measuring <6.2. I've added nothing but food to the water ...
Richard C's user avatar
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4 votes
2 answers
127 views

All my fish in reef tank died

My husband and I had 4 fish and a shrimp, we had to travel for a week and came back to 3 white decomposed bodies of fish and one, I guess, leftovers of a body... Yet, the shrimp was still alive! Now ...
Majd's user avatar
  • 41
4 votes
2 answers
237 views

Can't reduce my nitrite/nitrate levels, any help appreciated!

I set a 60 litre tank up and run it for 3 weeks, all water parameter levels fine. Added 4 fish, left 4 week's all fine. Added 4 fish again and 5 days later fish started to die. Checked levels and the ...
Lisa's user avatar
  • 41
4 votes
1 answer
433 views

Is a carbon or cartridge filter necessary in an aquarium with a simple biofilter?

I'm trying to setup my first aquarium, and in the process I've been reading all about the nitrogen cycle and properly cycling a tank to ensure there are bacteria present to work on the ammonia and ...
user avatar
4 votes
1 answer
85 views

Need advice on handling a recently recovered sick betta [duplicate]

My betta girl, Arora, was sick for about seven days, only laying at the bottom of the tank. I have her in a simple tank, since bettas are soft swimmers, and currents can make them depressed from ...
marissa Blankenship's user avatar
4 votes
1 answer
1k views

High nitrate level in tap water

I'm quite new to owning fish, we have a 65 liters (14 gallons) tank with 6 minnows, 2 danios, 2 platies and a Hong Kong pleco which has been running for around 1 month. During this month I have ...
Jim Valentine's user avatar
4 votes
1 answer
2k views

Temperature Range for Fancy Goldfish

I have an aquarium housing moors and an oranda. What is a safe temperature range for these fish? There seems to be conflicting information on this online. My aquarium is in a conservatory and in the ...
Mitch's user avatar
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4 votes
1 answer
118 views

How to change which water conditioner I'm using

I have two tanks: my ghost shrimp tank is using Tetra AquaSafe for Bettas water conditioner (the tank used to also contain a Betta fish, but no longer does). My Betta tank is using Seachem Prime water ...
EJoshuaS - Stand with Ukraine's user avatar
4 votes
1 answer
349 views

Fish dying despite apparently fine water parameters

We have a 40 gallon (150 liters) tank with an established nitrogen cycle. We went several months with just 1 three-striped cory and 3 gold dust mollies. The tank has its own filter that came with ...
Michael's user avatar
  • 215
4 votes
2 answers
1k views

Is a clean up crew necessary if there is no evident algae?

I've recently just established that my saltwater aquarium has cycled through ammonia and nitrites, and nitrates are ~10-20 ppm. I have been and am still ghost feeding the tank, since I purchased dry ...
Fus Ro Dah's user avatar
4 votes
1 answer
733 views

Does Juwel Cirax (ceramic biological filters) affect pH in the aquarium

Currently the water in my aquarium is having a higher pH than I want. What I wonder is if the Cirax filter (and in general biological ceramic filters) affects the pH value (by increasing it, or if it ...
eternitysharp's user avatar
4 votes
2 answers
6k views

Massive koi death in pond, without an apparent reason -- need help!

I am still experiencing unresolved problems. Shortly after 5/1/2018, I lost all of my koi due to a huge ammonia spike above 8.0ppm. I did multiple water changes to no avail, including a 100% water ...
Franz's user avatar
  • 41
4 votes
1 answer
759 views

Film on surface of female betta tank

I recently took in one of my friend's male Bettas to treat it for ich (Ichthyophthirius infection). When I brought him back I noticed a film on the surface of her other Betta's tank (this one is a ...
Christy B.'s user avatar
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4 votes
1 answer
90 views

Best residential aquarium test kits for accuracy versus affordability

What are the the best testing strips out there for measuring pH, ammonia, nitrates, etc.? I would like to find something more accurate (currently I'm using API test kits with droppers in 5 mL). It ...
Fus Ro Dah's user avatar
4 votes
1 answer
41 views

Can I put chemicals in before the filter?

I'm restarting my tank. It's been down for a year. I have all the chemicals and such to get it started, but haven't bought new filters. Is it safe to go ahead and de-chlorinate the water and take ...
Grace's user avatar
  • 41
4 votes
0 answers
263 views

Effect of KH on Neocaridina shrimp

It is my understanding that, in the aquarium, KH (carbonate hardness) raises the pH slightly, but primarily acts as a "buffer", preventing large pH swings. For Neocaridina shrimp (I keep ...
Matt's user avatar
  • 189
4 votes
0 answers
494 views

What causes a Norman's lampeye to lose the ability to move it's tail fin?

I have an aquarium with eight Norman's lampeyes (unfortunately 5 male, 3 female) and some other fish. Last Sunday I discovered that one of the Norman's lampeyes wasn't doing so well. She was nearly ...
Rolf ツ's user avatar
  • 161
3 votes
1 answer
4k views

How can I reduce my need to do a water change on my turtle's habitat?

Hello turtles masters :) I have 20cm (shield) turtle in 70L of water in aquarium. As a filter I use Repti Clear F350 (276L/hour 6W). I also use ReptoFresh and ReptoSafe. Problem: Even I clean the ...
Luxqs's user avatar
  • 65
3 votes
4 answers
4k views

Can I switch from using distilled water to tap water in aquarium?

I have always given my fish distilled water but I recently got a larger tank. Would it be dangerous to give them tap water with water conditioner in it, if I have been giving them distilled water?
Maya's user avatar
  • 39
3 votes
3 answers
3k views

Why do my Glofish Skirt tetras stay on surface after 30% water change?

I bought 7 Glofish Skirt tetras 3 weeks ago and today was the first time I've changed 25 - 30% water for them in 10G (38L) aquarium. Replaced water was tap water warmed for few hours and treated with ...
YMC's user avatar
  • 141
3 votes
2 answers
32k views

Aquarium is stuck on a nitrite spike

I am attempting a fishless cycle on a small, nano-planted tank that is getting stuck on extremely high levels of nitrite. The tank has been set up for about two weeks now. I am not dosing ammonia. I ...
Garrett Sanderson's user avatar
3 votes
2 answers
1k views

New GloFish are staying at top and sides of tank, not swimming around

I just bought three GloFish at PetSmart and put them in a tank I had ready at home. One of them stays at the top, sometimes it's two of them. The others stay near the wall. Petsmart said that my ...
Francisco's user avatar
3 votes
2 answers
739 views

Cooling aquarium with aluminum heat sink

Summer is approaching again. Last summer, I had a lot of trouble keeping the temperature in my aquarium at 30°C. My fish prefer 21-24°C, but I couldn't get it any lower than 30. So I want to avoid ...
HoneyBadger's user avatar
3 votes
2 answers
98 views

Can I fill my aquarium with the water from a purifier?

I only have a bore well in my home, so I bought an 8-stage water purifier with RA and UV, which adds minerals to the water. The final water TDS is 44. I'm keeping tropical fish, such as guppies and ...
Ashiq M's user avatar
  • 31
3 votes
3 answers
131 views

Filtered water for my fish tank

My kitchen tap is filtered with a Pentek 20 micron filter which reduces chlorine taste and odor (completely removes chlorine taste); it is a granular activated carbon filter. My question is, can I use ...
Stephen's user avatar
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3 votes
2 answers
1k views

Could my gravel be causing my tank to be cloudy?

I have several freshwater aquariums of following volumes: one 5 gallon one 10 gallon two 20 gallon one 29 gallon one 55 gallon and an outdoor 300 gallon pond. Aside from the pond, I started with one ...
Christy B.'s user avatar
  • 3,027
3 votes
3 answers
144 views

Goldfish are dying

I bought four goldfish 4-5 months back. I kept them in a bowl of water, and was daily removing a glass of water and adding a fresh glass of water. Starting 2-3 months ago, everything was fine. But ...
Akshay Chawla's user avatar