Questions tagged [aquarium]

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

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23
votes
4answers
72k 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 ...
23
votes
2answers
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 ...
20
votes
6answers
13k views

Cooling a goldfish tank during summer

During the peak of last summer we had several goldfish that died after several days of hot weather and I suspect it was related. According to the Goldfish article on Wikipedia: Extremely high ...
19
votes
2answers
5k views

Why don't fish grow to their full size in a small tank?

I have heard that when a fish is kept in an aquarium that is too small for the fish to grow to its full size, it will only grow to a portion of its possible size and its lifespan will be shorter than ...
19
votes
4answers
28k views

What is the maximum proportion of fish per liter in an aquarium?

How many fish can I have per liter in my aquarium, or how much water should I have for each fish? For specimens like Black tetra and Neon, that don´t require that much space and can coexist with ...
19
votes
2answers
34k views

Where did my danio fish mysteriously disappear to?

I have 8 white skirt tetras, 8 albino cory cats, and had 8 danios. Now I have 7 danios. One mysteriously disappeared. I am very doubtful it is hiding because my danios don't do that; all they do is ...
19
votes
1answer
924 views

Do fish need a dark environment at night?

Is it bad if I accidentally leave the lights lit on a fish tank overnight? Or do the fish not care whether it is light or dark?
18
votes
2answers
48k views

What's the least painful way to euthanize a fish?

My aquarium fish is sick and I don't know the least painful way of putting it down. How should I kill it so that it doesn't suffer?
17
votes
3answers
1k 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 eat ammonia will produce nitrate, and nitrate-eating bacteria will make nitrite. I understand ...
17
votes
3answers
8k views

Is it true that goldfish growth is limited by container size?

As I grew up, I was taught that a goldfish will only grow to a certain point dependent upon the size of their container and how many fish are in the container; all the fish within the same container ...
16
votes
8answers
13k views

Adding neon tetras to an existing school - Any concerns?

I have three neon tetras and I'd like to add some more. My reading on the subject gives me different advice on what is likely to happen. One outcome is the two sets of neons will not school together, ...
16
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4answers
1k views

What are some effective non-chemical methods for controlling the snail population in an aquarium?

I always had problems with snails in my aquarium. They reproduce faster than I can remove them. Last time I had such problem it was solved by restarting my aquarium: took all the water of it, throw ...
16
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3answers
2k views

How do I control the convict fish population of my aquarium?

I made the mistake of introducing convict cichlids to my aquarium from a friend who was trying to get rid of them (should have been a big tip-off). Over time, these things overtook my tank and are ...
16
votes
1answer
4k views

Do I need a bubbler in my aquarium?

I have an aquarium of 280 liters (~ 74 gallons). I use an external filter, so the water returns to it like a small waterfall. Do I need a bubbler to improve the O2 level of my aquarium, or adding one ...
16
votes
1answer
2k views

Are simulated thunderstorms beneficial for a saltwater aquarium?

Recently, I ran into a larger saltwater aquarium with a lighting system that includes simulated lightning storms. At seemingly random times, the lighting system would simulate a lightning storm using ...
15
votes
3answers
128k views

Can I make my own driftwood for my fish tank?

Driftwood is expensive to buy at the store. If I find a piece of wood I really like, is it possible to make it into driftwood than can be safely used in my fish tank?
15
votes
2answers
7k views

How many plants do I need for my aquarium?

I have an ~120 litre aquarium containing 30-40 small fish (tetras and barbs). What volume of plants is enough to keep it in balance? I'd prefer not to introduce new entities to the water for as ...
15
votes
2answers
553 views

How can I resolve a fish conflict in my aquarium?

I want to have bettas in my 50-gallon tank, which will consist of schools of fish. Suppose I obtain a group of (maybe 4) female bettas and I have a shoal of 10 neon tetras in a 50-gallon tank. There ...
15
votes
3answers
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 ...
15
votes
1answer
2k views

What are the safe materials for an aquatic turtle aquarium?

What are safe materials for inside an aquatic turtle aquarium? I've seen plans using PVC, concrete, lumber, etc. but am concerned about chemicals.
14
votes
4answers
3k views

Which fishes can live together with neons?

I have some 50 neons in my aquarium. Recently, I've added some black tetras. They live together very well. What other species could I add so that they would still live "in peace", i.e., without ...
14
votes
4answers
868 views

How to remove the algae from the glass of an aquarium?

I have an aquarium and it has algae on the glass. The algae is somehow so attached to the glass that I´m afraid I'd scratch the glass if I tried to clean it using some hard plastic. How can I remove ...
14
votes
4answers
241k views

Is distilled or spring water better for fish tanks?

A recent answer suggested that if your home water supply was not used for filling a fish tank, that 'spring water (not purified water)' was preferred over distilled water. What advantages would one ...
14
votes
2answers
2k views

How do I know when I need to replace the charcoal in my aquarium filter?

I recently purchased and installed an External Canister Filter in my aquarium which includes a filter stage with little bags of charcoal media. Clearly I need to replace this at some interval because ...
14
votes
2answers
79k views

What's the best way to clean a contaminated aquarium?

I had an aquarium apocalypse a while back. Overnight, some white fungus grew over everything and killed most of the fish in my 25 gallon aquarium. Rather than cleaning it right away, I ignored it ...
14
votes
1answer
678 views

Do freshwater snails in aquariums pose any harm to the fish in my aquarium?

Sometimes I have snails in my aquarium, and I have hard times getting rid of them. I was wondering, do they pose any harm to the fish in my aquarium? I mainly remove them because they are ugly and ...
13
votes
1answer
8k views

My fish are disappearing :(

I have a 10 gallon tank I had 3 guppies and some snails. Only 2 adult snails and some babies. I had 3 guppies the night before and the next day one of my guppies disappeared. This has happened before ...
13
votes
7answers
90k views

Can I put any other fish in with a male betta?

I had a male betta fish for a long time, and was told by the people at the pet store that I could put in a pleco fish (aka an algae eater) because it would stay near the bottom. Since, he claimed, the ...
13
votes
6answers
45k views

Can I repair a leaking aquarium without removing all the water and fish?

If my aquarium begins to leak, I know I could repair it by removing everything, applying silicone (or another sealant), waiting for it to cure, and then starting over. If the leakage is at the top of ...
13
votes
5answers
20k views

Which shrimp will co-exist with my loaches and schooling fish?

I plan to keep about 4 yo-yo loaches and a few shoals of schooling fish (neon tetras, danios, mollies, and maybe more smaller fish) in my tank. I heard that ghost shrimp eat small fish. What type ...
12
votes
5answers
160k views

How do I eliminate the black algae from my planted aquarium?

My aquarium has live plants with a betta, hatchet fish, barbs, a cory, and a Siamese algae eater. Black algae is growing on the decorations and glass. I scraped it off the glass. What else should I ...
12
votes
1answer
7k views

Is this turtle tank too dirty?

My sister got two turtles a while back, and it was great at first. Though now it seems it's too much for her to properly take care of them. Their tank is very dirty, though she claims they like that. ...
12
votes
2answers
2k views

Is it ok if I stir the substrate of my aquarium?

I have an aquarium with a 5 cm (+- 2 in) rock-and-clay pellets substrate. I stir it every 6 months, to remove some of algae and so on that is deposited there. That way, the water gets a bit muddy and ...
12
votes
2answers
275 views

Do plecos keep their territory permanently?

I have a new pair of clown plecos, and need to reshape the tank a little bit to give them more hiding places. They're still small (about two inches) and have only been in the tank about a week, but ...
12
votes
1answer
387 views

Would a new 500 L marine aquarium need to be cycled again if upgraded from 80 L nearly finished cycling?

I have a 500 L aquarium I would like to fill with saltwater and eventually fish. I have an 80 L tank starting to cycle now on the 3rd week, containing about 2 kg of live rock. I plan to partially ...
11
votes
9answers
35k views

Why do fish tanks have closed roofs?

Ideally to maximize oxygenation, the fish tank should have a large exposed surface area, but I find that in the commercial ones the roof is closed. Also is it OK if we keep the roof exposed ? I tried ...
11
votes
3answers
4k views

Is LED lighting good enough for a healthy saltwater tank?

I have seen good reviews for LED lighting for aquariums, with people mentioning they use them for saltwater. Do they generate enough of the right light for happy live rock and whatnot? One I am ...
11
votes
7answers
65k views

How to anchor aquarium plants?

I have a number of live plants in my aquarium. One of them - an oxygen weed - frequently works its way loose from the gravel in which I've planted it. I find myself often having to retrieve bits of ...
11
votes
3answers
4k views

How long should I wait after moving aquarium before adding new fish?

I recently moved my established aquarium from one room to another in the house. I had to remove most of the water so that I could lift the aquarium (with help!). Once in the new location, I returned ...
11
votes
3answers
9k views

Aquaponics: lobsters, clams, oysters and tilapia all in the same tank?

I've really been getting into gardening over the past year and have just started looking at aquaponics. I hope to one day build my own homestead, and want a big greenhouse with a central aquaponics "...
11
votes
1answer
870 views

Is my bioload too high?

I have about 12 plants in my 60 gallon tank. I am planning on adding the following: 6 Albino Corys 3 Black Mollys 1 Male Gourami and 2 female Gourami 3 SAEs (siamese algae eaters) 5 Yo-Yo Loaches ...
11
votes
1answer
300 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 ...
11
votes
2answers
658 views

Identify algae in aquarium

I have been trying to reduce the algae I have in my 60 gallon aquarium that has been caking to the leaves of my planted staurogyne repens. I have reduced my lighting to only be on for 9hrs per day ...
10
votes
2answers
19k 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 ...
10
votes
1answer
272 views

How stressing is it for fish when someone taps/slaps their glass?

Everything I've read says you shouldn't tap an aquarium because it startles the fish, and that's bad for their mental health. I've been satisfied by that argument. As of late, my toddler has started ...
10
votes
1answer
8k views

What non-fish animals are safest for my freshwater aquarium? [closed]

I am filling a 55-gallon freshwater tank. I am planning to add group fish, schooling fish, like guppies and tetras. I am avoiding African Cichlids and solitary fish. I am looking for additional, ...
10
votes
1answer
734 views

How To Safely Remove a Sea Cucumber?

I've had a tiger tail cucumber getting along quite well in my tank for about six months. One unfortunate night, my wife decided to [quite amateurishly] rearrange the tank and drastically spiked the ...
9
votes
4answers
210 views

Besides water quality, what should I consider before adding more tropical fish?

I want to add additional fish to my freshwater aquarium, and I want to make sure they have the least chance of dying. After considering the answers to this question about water, what else should I ...
9
votes
3answers
39k views

How long can an aquarium remain without any filter and heating?

The filter and the heating of my aquarium do not work anymore. After trying to solve the problem, I've concluded that the only way to solve the problem is to buy a new filter and a new heating. Can my ...
9
votes
2answers
3k views

How do I identify abnormal or erratic fish behavior?

I have 8 Albino Corydoras and all they do is swim against the wall all day, even when the light is off. I am guessing my tank has great reflection. They almost never go into the middle of the tank; it'...

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