Questions tagged [aquarium]

Indoor containers holding water and creatures (fish, crustaceans, snails, etc.). For specificity, consider adding a "freshwater" or "saltwater" tag.

62 questions with no upvoted or accepted answers
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Affect 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 red cherries,...
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122 views

What should the ideal salt content of a brine shrimp grow-out tank be?

I am raising brine shrimp in a grow out tank and I normally use 1.018 specific gravity of salt in the hatchery. I have read online that the the ideal specific gravity can range from 1.018 to 1.045. ...
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53 views

Goldfish skin around the intestine area is gone and stomach looks to be caved in

This is my first time posting so I’m sorry if I made any mistakes with my post. I think I’m going to lose one of my goldfish. About 2-3 weeks ago both of my goldfish (I only have 2) developed ammonia ...
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37 views

Aquarium ammonia question

My wife and I purchased a small 5.5 gallon aquarium: Top Fin Starter Kit with a silent-stream carbon filter. We are brand new with aquariums and unfortunately didn't do our due diligence and research ...
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100 views

Suddenly lethargic Antenna/ Suckermouth catfish

I've got a 31,7 gallon tank in which about 35 fishes live. For cleaner fishes it is: 2 Antenna catfish (black and brown) and since almost 4 weeks now also 5 armored catfish (others are all non ...
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71 views

Kindly help me choosing right silicone from my mentioned list

I am facing some challenges and need your help and advise. In my country, unfortunately, I don't find Aquarium safe sealant except 2 types. Only what I have seen in local stores are DAP and Loctite ...
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86 views

My aggressive fish has become very shy, afraid in the last week. What changed?

I have a 225 gallon aquarium. I have 10 large fish inside. The most aggressive fish is my Red Devil. He normally chases all other fish and the others will rarely if ever attempt to go after him. This ...
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827 views

Turtles: Fresh water in aquarium turned red after few minutes

Around 30-40 mins ago I changed aquarium water, cleaned the filter and dropped some toya food for my turtles. Now I am seeing water turned red, I have already checked there are no cuts, bites or ...
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44 views

White patch and spot on my goldfish?

One of my goldfish, which I've had for 3 months, suddenly got a white patch on the top and a white spot on its left side (the yellow-black one in the picture). I just noticed it today, but I'm sure it ...
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33 views

Digital pH Tester - fish tank

Is there any digital pH tester on the market at all? I've done a search around and pet-stores and the usual companies (Fluval, API, etc) don't sell them as far as I can tell. Some companies I don't ...
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38 views

Best Brown Algae Eaters for Freshwater

I have brown algae growing in my tank and I was wondering if Cory Catfish could clean it. If they could not, what other fish, besides shrimp and plecos, could clean the algae? Just a note, my tank is ...
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39 views

Nitrates spike right after a 50% water change (ammonia,nitrite and nitrate readings were all zero before it)

Need help in a situation I'm a bit puzzled with. I have an established, 3 foot (90 cm) bare aquarium with discus. I have added a few plants in the last 3 months. Once the new plants have adapted to ...
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47 views

Blackworms and aquariums

I just started to study the topic of cold water aquariums. I ended up quite quickly to this site, offering some insight on how to grow blackworms as food for fish. The end of the story gave me mixed ...
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16 views

When (or If) to reseal an sump?

I bought a glass sump (intended for a fresh-water tank) 2nd hand that has clearly been put together at home. The construction looks great, but you can tell its homemade since the seal has "frayed ...
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76 views

Reasons for killer fishes?

I've got a recurring problem with killer fish. In the last 3 years I repeatedly had recurring sudden spikes in fish deaths. Via pure coincidence I found out that it was no strange sickness or water ...
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63 views

What are these little creatures in my aquarium?

I have recently noticed these tiny creatures on the glass and other surfaces in my aquarium. What are they, and where could they have come from? They are about the size of a sesame seed and growing. ...
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145 views

Freshwater aquarium - many fish batches dead, LFS keeps claiming that water is 'perfect'

Got a new 30 gallon aquarium ~1 month ago. The seller told me to use tap water (no conditiner), run the pump for a week (to get rid of chlorine), then bring a sample for test. Did that, didn't use ...
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47 views

Starting up a canister filter that has been off for a while

We prepared an Eheim canister about a week ago and had also put some tank water in it but, because of a series of setbacks, we haven't been able to start the filter in our new tank. We are still not ...
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44 views

Green water after refilling dry tank with no fish

Several months ago, I moved to new city and had to drain my 20-gallon tank and give away my fish. The tank sat empty (aside from the gravel) for several months. Last week, I decided to fill it back up,...
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43 views

Completely Self Sustaining Aquatic Environment in a Sealed Jar

I recently got the idea into my head to create an entirely self sustaining aquatic environment in a (large) sealed jar. I'd like to include: A layer of soil and gravel at the bottom A large number ...
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35 views

Air pump selection

I'd be really thankful if anyone who owns any of the air pumps mentioned in this article https://fishtankclub.com/aquarium-air-pump/ could tell me which one is the best, from either personal ...
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83 views

Is the way I moved my fish to a new tank ok?

Yesterday I got a new tank, I upgraded from a standard 10 gallon tank to a 29 gallon. The ten gallon was over populated so I decided to try and move my fish over as soon as I could. The ten gallon ...
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1k views

Why do fluidized sand filters need a prefilter?

When talking fresh water fish tanks, why do people recommend that fluidized sand filters have a prefilter like a sponge? Assume there is a separate system for removing solid waste from the tank, like ...
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146 views

Flourish Excel melting my hair grass and ludwigia

Folks, I got a nano-tank setup of 6 gallon (around 23 liters), in which I got: Tall Grass (Eleocharis Vivipara) Ludwigia Mini Dwarf Hair Grass (Eleocharis Acicularis) For the first 3 weeks I didn't ...
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209 views

Missing hermit crabs?

My little hermit crab joy has abandoned her shell last night and I have no idea where she is. I have no idea what happened and my other crabs look fine. She has never done anything like this before ...
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197 views

I think my female map turtle is trying to lay her eggs in the water

I have two map turtles; one male and another one female. I caught them doing the mating dance and the deeds plenty of times. I got the male from a friend and he was lonely, so about a month later ...
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95 views

How to setup a planted aquarium

I have a 4 feet by 6 feet hole newly introduced on one of my walls. This wall in particular, separates the foyer and the drawing rooms in my house. I have mentally worked out a plan to use this hole ...
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Can't find fish disease, Fish body Poped Up

It's sometime since my fish body poped up with color of white, and then it's tail some how more blody, i asked someone and send picture he didn't reply, so i went to store yesterday, and he replied to ...
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70 views

Best environment and Matches, beside Beta, Snail, and small Plecos

I own a very small tank, which I'll replace soon, with I think a 40G tank. I had a betta, and yesterday i bought several fish, of which only the placus, 5 tiny fish, and two snails survived the war, ...
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55 views

Overflows on an established saltwater aquarium

So I have a 120 gallon saltwater aquarium with 4 1" bulkheads in back. There is a pair on either side of 4' long aquarium each pair have hold 10" apart. Right now I just have screens over the ...
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83 views

Considerations before getting mussels (or other bivalve)

I'm looking for alternative natural filters for my tank to combat algae. I've read that a mussel can filter up to 100 gallons/day, consuming algae and detritus. My concerns are: I grow copepods ...
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546 views

Blood Parrot Cichlid Behaviour

I have Two blood parrots among other kinds of fish as well, one of them hits on the other however, the aquarium is big enough (50gal) and decorated so each can have their own hiding place. Once I ...
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83 views

Is it possible to use aquarium salt instead of marine salt to raise brine shrimp to adulthood?

In order to raise brine shrimp to adulthood, I have heard that it is better to use marine salt instead of aquarium salt in the grow-out tank. Aquarium salt (sodium chloride or NaCl) is widely used to ...
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56 views

Is My Guppy Sick?

My adult guppy has been acting strange in my opinion. He has been inactive unlike the other guppies and platy fish in the tank. I’ve noticed that he has been swimming in place at the top of the tank. ...
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65 views

How much space does a fish need?

I am wondering if there is any accurate way to determine how much space any particular fish needs. I have heard things like 1 gallon per inch of fish, but this cannot be accurate as a betta (2.25 ...
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22 views

If i have sand substrate will my good bacteria beneath the sand still get fed?

I just put power sand, pumice for living bacteria, then on top of it hard sand, then the toppest is full the finest granule sand. I filled the water and now wait to cycle the tank. I wonder whether ...
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What do I do about nematodes (roundworms) in aquascape?

I have 10 gallon (38 liters) tank aquascape, no fish yet, I noticed around 20 nematodes swimming around, can I just put platy fish and shrimp there? How do I get rid of the nematodes?
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52 views

What is this fish disease?

I had 4 platies and 5 danios but there are only 1 platy and 4 danios left. mysteriously, they die in the same manner, like sinking to the bottom of the tank and resting there. I was wondering if they ...
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29 views

Advice on sick Betta. Possible Dropsy?

About a week ago I noticed my betta, Florence, had a lump on his right side. In the days prior he was very slim and active. On the day of finding it I noticed he was still normal, his appetite hadn't ...
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29 views

Separating the fry from parents - German Blue Ram

If I leave the eggs to hatch with parents and let the parents raise the fry, when should I take the fries out? I mean, for how long they can live with their parents? I know at some point parents will ...
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31 views

What might cause a Celestial Pearl Danio to go off their food?

Overview One of my celestial pearl danios (CPD) has gone off their food and is skinny. Whilst it might be too late for him, I want to save the other 5 CPDs in the tank. Any ideas? Background and ...
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29 views

Help with Fin Damage on my Betta

So in the past my betta's fin got snagged on a plant I learned should not have been in his tank at all.. This is my first fish and didn't realize that the only fake plats in the tank should be silk. ...
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38 views

I'm willing to use CO2 tablets in my planted aquarium but I'm worried that it may cause any harm to my guppy fish

If there is anyone who knows about planted aquarium please help me. Is ISTA CO2 tablets good for planted aquarium? Will this harm my fishes? Should I use both CO2 and oxygen filter in my tank?
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25 views

Will ichthyophthiriasis medicine harm my betta if he doesnt actually have ich?

A few days ago I noticed a spot on my betta's side just next to his gills. It wasn't completely white in color but definitely lighter than the rest of his body. I tested his water and there was an ...
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36 views

Why is he so small?

it’s kinda hard to see, but my flame tetras is super small! I do not know the gender of all of my fish, but 5 of my tetras are roughly the same size, but my 6’th one is really small. When I feed them, ...
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33 views

Can I use hard surface protectant to prevent algal growth on my aquarium front glass? Is there something else that will prevent them sticking?

Siliconizing glass makes it non-sticky. Does that or something else prevent algae from sticking to glass so I won't have to scrape the front pane all the time? I want to treat the tank before setup.
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32 views

Easiest Ancistrus to breed

To follow up on a previous question of mine and some information provided in an answer there (Ancistrus breeding in rock pile) What Ancistrus is the easiest to breed? My reasoning around this would ...
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690 views

Lump on Goldfish

Several months ago my red cap oranda developed a lump on his side. It resembled an acne nodule. The lump was beneath his scales and didn't seem to cause him any trouble. He had some mild red streaking ...
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172 views

Fatal cotton like fungus on goldfish spreading to other?

I've had a black moore goldfish for 5 years. I just recently brought him with me to a new city and he's temporarily in a five gallon aquarium. Originally he was in a 30 gallon aquarium with other fish ...
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713 views

Should I move my sick fish to a clean tank for treatment?

My fish (all three) have ick, they currently live in a 33g tank. The fish are two platys and 1 catfish (he's small). I have a spare 10g tank that only has gravel and water in it. It would be easier ...