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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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-...
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 ...
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 ...
3 votes
2 answers
3k views

Uncontrollable ammonia in an apple snail aquarium

I have three apple snails in a 10-gallon (37.8 liters) aquarium and the ammonia stays off the charts. I only keep seven to eight gallons (26 to 30 liters) of water in the aquarium so that the top ...
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 ...
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. ...
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 ...
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 ...
1 vote
1 answer
180 views

Fish in rainwater outside

I saw an answer to a question about CO2 addition, and it states that fish themselves can make water from rain acidic (I assume they do it by breathing out CO2). Now I am thinking about my small pond ...
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 ...
2 votes
2 answers
98 views

Is the injection of carbon dioxide into a planted aquarium a detriment to fish living in it?

From the start, thank you for your time and consideration. Whilst planning a planted aquarium setup that would include CO2 injection, I stumbled across an article about possible behavioral ...
1 vote
0 answers
24 views

How to get rid of black hair algae?

My aquarium is infested; it's on the plant leaves/pebbles/glass. I tried to remove everything manually but it soon bloomed again, big water changes, shortening the lighting time, but no success. It ...
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 ...
2 votes
1 answer
104 views

New betta problems - I was unaware of cycling before new tank

So I am experiencing a plethora of issues with my new betta. I hope he makes it out okay. I was unaware of the cycling process before putting him into the new tank. It's small (1 gallon) and temporary....
-1 votes
1 answer
753 views

Fish tank keeps becoming cloudy with a green tint

My friend texted me that her 30 gallon (around 114 liters) fish tank keeps becoming cloudy. She has eight small fish in the tank, which means that her tank is not overcrowded. She told me that after a ...
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 ...
2 votes
1 answer
2k views

Fish swimming with mouth always touching the water surface

I have a fish bowl and they are all swimming with their mouth touching the water surface, almost always. Are they hungry? Do they suffer from insufficient oxygen concentration in water? Is the water ...
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?
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 ...
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 ...
3 votes
1 answer
5k views

Common goldfish with "bleeding" around face, gills and fins

I look after two common goldfish in a 56L filtered tank with an airstone for additional aeration. Over the past two days, one of the fish has been appearing to be sick, suffering with what I can only ...
2 votes
0 answers
53 views

Color change in guppy

My guppy looked pretty healthy and shiny just three days ago: And yesterday... it just darkened. The scale pattern just got so dark all of a sudden. Should I be worried? And this is today:
2 votes
0 answers
44 views

Why are CO₂ diffusors supposed to be located far from water movement?

My Dennerle Profi-Line CO2 Diffusor recommends to place it far from water movement, e.g. the filter output, but when I put it there I see that the fine CO2 bubbles which take about 15 seconds to rise ...
2 votes
1 answer
260 views

Female guppies are fine, but male is sick

I recently got a 54L aquarium and stocked it with 4 small guppies - 1 male and 3 female. Initially they all seemed to be doing fine - eating, very active within the tank etc. The male looked great ...
-1 votes
1 answer
137 views

Betta dying help

I forgot to save the old water from when I cleaned my betta’s tank and now he’s floating at the bottom. What can I do? I have already tried putting my guppies’ tank water in to do half half and it’s ...
17 votes
3 answers
2k views

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. ...
24 votes
3 answers
3k views

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 ...
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 ...
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 ...
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 ...
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 ...
3 votes
1 answer
3k views

Is my fish suffering from fin rot or is this just a sign of wear and tear?

I've had this goldfish for around 2 years now, and have no problems with it at all. I changed it over to a bigger tank (22 litre) around 3 to 4 months ago, and until now have had no issues. The tank ...
0 votes
1 answer
87 views

What’s wrong with my Betta fish?

I can’t tell if it’s a fungal disease, but he lost all of his color. My sister never cleaned his tank so I think that might be the reason behind it, but I don’t know what disease he has so I have no ...
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 ...
3 votes
0 answers
28 views

How long should I leave old filter in new tank after installing a second, new filter to replace the old one? [duplicate]

Hi I started a tank a week ago with 3 guppies in my daughter's room, but the HOB filter was too loud, so I have now changed to Fluval U2. I have both filters in tank now since yesterday, but my ...
3 votes
1 answer
20k views

Why does my nitrate level always read 0?

I have the following tanks: 5 gallon, 2 months old - housed betta and shrimp 10 gallon, 2 weeks old - used established media to seed aquarium alongside cycle and beneficial bacteria 3.5 gallon - ...
25 votes
4 answers
80k views

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 ...
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,...
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 ...
1 vote
2 answers
255 views

Why is my oranda goldfish gasping at the surface?

I have 110 gallon (420 liter) tank, which contains 1 ranchu measuring 13 cm, 1 ranchu measuring 10 cm, and 1 oranda measuring 8 cm. The oranda is gasping for air, while the other fish seem fine. ...
2 votes
1 answer
110 views

Why are my 6 flame tetras not swimming like normal?

I have a 29 gallon aquarium with 6 flame tetras, 2 smaller mystery apple snails and 2 other bottom feeders (brown, spotted, with dorsal spike and main fin spikes). Usually I see my 6 flame tetras ...
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 ...
2 votes
1 answer
151 views

Can a shrimp be a pet?

I want to keep shrimp as a pet, but it would always be dead in about 1 or 2 days. I read lots of information and I know that it is lack of dissolved of oxygen. How to get the water full of dissolved ...
1 vote
1 answer
344 views

How to maintain a snail tank without a filter?

I have received a rabbit snail, two golden Incas, and a nerite. I only have a 10 gallon tank and my parents will not allow me to get a filter for it. I am a first time keeper and very worried about ...
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 ...
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 ...
2 votes
1 answer
217 views

Can an understock tank be under filtered?

I asked this question a couple of month ago, I suggest you read it first so you know the context. I have a 15 gallon tank with 10 neon tetras, 4 zebra danios, 2 Endlers and a bunch of red cherry ...
2 votes
2 answers
872 views

Can Acidic Water Fish Live In Alkaline Water?

Can acidic water fish live in alkaline water? For example, my tank pH is around 7.5 because its substrate is made of dolomite. I basically have molly and platys, but I want to have other kind of fish. ...
2 votes
1 answer
15k views

How many days does it take an ammonia spike to occur?

I recently bought a new aquarium along with four small tiger barbs. I'm currently learning how to cycle the water so I was wondering how long can the fish live in the unchanged water before it needs ...
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 ...