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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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25 votes
4 answers
81k 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 ...
woliveirajr's user avatar
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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 ...
woliveirajr's user avatar
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23 votes
7 answers
14k 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 ...
PeterJ's user avatar
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21 votes
2 answers
1k 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?
Timtech's user avatar
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20 votes
2 answers
8k 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 ...
Jacob B's user avatar
  • 636
20 votes
4 answers
31k 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 ...
woliveirajr's user avatar
  • 4,034
20 votes
2 answers
49k 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?
Raystafarian's user avatar
  • 1,116
20 votes
2 answers
43k 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 ...
Don Larynx's user avatar
  • 1,757
18 votes
8 answers
19k 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, ...
Nicholas's user avatar
  • 591
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. ...
Peter Grace's user avatar
17 votes
4 answers
13k 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 ...
user avatar
16 votes
4 answers
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 ...
woliveirajr's user avatar
  • 4,034
16 votes
3 answers
135k 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?
Spidercat's user avatar
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16 votes
2 answers
635 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 ...
Don Larynx's user avatar
  • 1,757
16 votes
3 answers
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 ...
JohnFx's user avatar
  • 878
16 votes
1 answer
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 ...
woliveirajr's user avatar
  • 4,034
15 votes
4 answers
2k 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 ...
woliveirajr's user avatar
  • 4,034
15 votes
4 answers
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 ...
woliveirajr's user avatar
  • 4,034
15 votes
2 answers
10k 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 ...
martin's user avatar
  • 477
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
  • 1,757
15 votes
1 answer
3k 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 ...
Steven V's user avatar
  • 532
14 votes
4 answers
251k 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 ...
James Jenkins's user avatar
14 votes
5 answers
30k 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 ...
Don Larynx's user avatar
  • 1,757
14 votes
2 answers
3k 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 ...
JohnFx's user avatar
  • 878
14 votes
2 answers
85k 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 ...
Keltari's user avatar
  • 1,323
14 votes
1 answer
713 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 ...
woliveirajr's user avatar
  • 4,034
14 votes
1 answer
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.
Timtech's user avatar
  • 3,271
13 votes
1 answer
11k 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 ...
Abby's user avatar
  • 139
13 votes
7 answers
94k 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 ...
user avatar
13 votes
6 answers
51k 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 ...
woliveirajr's user avatar
  • 4,034
12 votes
1 answer
10k 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. ...
The Oddler's user avatar
12 votes
4 answers
6k 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 ...
Nicholas's user avatar
  • 591
12 votes
1 answer
412 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 ...
user214's user avatar
  • 171
12 votes
1 answer
318 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
  • 121
11 votes
9 answers
41k 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 ...
pet101's user avatar
  • 297
11 votes
5 answers
165k 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 ...
Jeni's user avatar
  • 790
11 votes
3 answers
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 ...
jumpdart's user avatar
  • 233
11 votes
2 answers
4k 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 ...
woliveirajr's user avatar
  • 4,034
11 votes
3 answers
12k 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 "...
user avatar
11 votes
1 answer
989 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 ...
Don Larynx's user avatar
  • 1,757
11 votes
7 answers
77k 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 ...
Nicholas's user avatar
  • 591
11 votes
1 answer
872 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 ...
Cort Ammon's user avatar
11 votes
2 answers
990 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 ...
The Nightman's user avatar
10 votes
6 answers
11k 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
  • 1,374
10 votes
2 answers
22k views

How To Introduce Additional Clownfish

I've had two clownfish for 6 - 8 months, one orange/white and one black/white. Now I'm trying to add more, but meeting heavy resistance. I realize that you can't mix species but I always thought ...
Gary's user avatar
  • 809
10 votes
2 answers
27k 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
  • 1,757
10 votes
2 answers
313 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 ...
toxotes's user avatar
  • 3,843
10 votes
1 answer
895 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 ...
Gary's user avatar
  • 809
9 votes
4 answers
220 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 ...
Jeni's user avatar
  • 790
9 votes
2 answers
96k views

How can I keep a very small tank well oxygenated?

First of all, I didn't have any experience on fish keeping before. But my child really wanted to have some fish, so I bought a small (0.5 gallon) fish tank. I got him two guppies and two gold fish. ...
user1285419's user avatar

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