Skip to main content
39 votes

My fish are disappearing :(

The most reasonable explanation is that it died and was eaten by the other fish / snails. Note that some snails are carnivorous. Many fish are cannibalistic if the opportunity arises. Some leftovers ...
virolino's user avatar
  • 2,655
35 votes
Accepted

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

Fish excrete hormones in their waste. In a confined space like an aquarium, these hormones build up and act as growth inhibitors, this is basically an evolutionary mechanism, to prevent fish from ...
Jestep's user avatar
  • 3,093
12 votes

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

Don't panic, it's probably okay! The key thing here is that you caught the error and asked the question. I'll cover both bases here and try and explain a few things (forgive me if you already know ...
Henders's user avatar
  • 5,125
11 votes
Accepted

Dried goldfish became alive after re-introducing into water

Goldfish can live for up to three hours out of water. It also depends on where your goldfish lands. If they landed somewhere moist or in the puddle of water they spilled out of their bowel, they can ...
user11111111111's user avatar
9 votes
Accepted

Why did my Guppies not grow for 8 months?

There are a couple of issues that I can see here that may be limiting how your fish grow. 1. Temperature You didn't mention having a heater for the tank and I cannot see one in the picture that you ...
Henders's user avatar
  • 5,125
9 votes

One discus fish bullying the other discus

I have to strongly suggest taking these fish back to the store. I've kept discus for many years and bred discus in the past for roughly a decade. I can say with almost complete certainty that these ...
Jestep's user avatar
  • 3,093
9 votes

Where do you keep aquarium plants until you plant them in an aquarium?

Not only can you put your plants in another container, but you should. It is always a good idea to quarantine plants in a separate container for a few weeks before adding them to your tank, otherwise ...
James Yarrow's user avatar
8 votes

What animal can be kept in a tank just under 3 gallons?

It is very hard to get a small tank to be in biological balance and to keep the water quality good, so I suggest you use this tank only for treating your fish with medication. This can be helpful if ...
trond hansen's user avatar
  • 19.6k
8 votes
Accepted

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

It is special in a sense that most aquarium setups include a lot of equipment, mainly a filter; the filter facilitates cultivation of nitrifying bacteria that are responsible for neutralization of ...
lila's user avatar
  • 210
8 votes
Accepted

Fish swimming with mouth always touching the water surface

Fish swimming with their mouth constantly glued to water surface is a sign that they are gasping for breath. However, the reason for them being short for breath usually isn't the low oxygen ...
lila's user avatar
  • 210
7 votes

Gourami breathing at water's surface

Don't panic! This is entirely normal behaviour for Gouramis (within moderation). Gouramis are part of a group of fish called 'Labyrinth Fish' (Sometimes also known as 'Anabantoids'). These fish have a ...
Henders's user avatar
  • 5,125
7 votes
Accepted

Best way to adjust fish tank water chemistry

Firstly, I'll go for my old refrain "consistency is key". It's better to have consistent water parameters than changing them continually to 'chase the perfect conditions'. Firstly, your nitrite ...
Henders's user avatar
  • 5,125
7 votes

Can I put newborn platies with neon tetras?

Neon tetras will attempt to eat these. I've kept neon tetras with shrimp and they would often pursue the baby shrimp. Luckily for the shrimp, they're pretty fast and hard to see so the fish would ...
Henders's user avatar
  • 5,125
7 votes
Accepted

What plant is this?

It is Caulerpa algae, although it has roots, stems and leaves (may be C. prolifera or C. floridiana). Tangs, Moorish Idols and other fish eat it. It grew very vigorously in my aquariums and so can ...
blacksmith37's user avatar
  • 1,844
7 votes
Accepted

Fish needs light in its tank or not

It's important to turn the lights OFF at night, so fishes can sleep. During the day, light could be open for 6, 8 or 10 hours. Lights are important for you to look at your beautiful aquarium, but the ...
Manuki's user avatar
  • 953
6 votes
Accepted

How to test if fish tank will break and flood my house?

This link here outline pretty well how to check for bad sign around an used tank and also outline how to prepare the tank for your use. I will resume briefly what to check but I leave the link so you ...
Rémi's user avatar
  • 1,027
6 votes

How can I find out the species of my baby turtles?

I'd be more inclined to think they're probably yellow belly sliders which are the same as far as care and size go, but they don't develop the red marks on the side of their head. I would stick with ...
Jestep's user avatar
  • 3,093
6 votes

Help increase Betta Fish lifespan beyond 1.5 Weeks

Fish are a complicated thing so I will go over specifics for betta fish. Aquarium should be 5 gallons minimum. Filter should contain activated carbon (absorbs contaminants), biomax (helps beneficial ...
Rebecca RVT's user avatar
  • 12.6k
6 votes

Will cooking rocks and branches in the oven make them safe for aquarium fish?

Ensuring that the rocks and wood that you put into your aquarium is definitely an important step to take before adding anything. I've seen many, many horror stories of people adding wood/rocks to ...
Henders's user avatar
  • 5,125
6 votes
Accepted

How to move an axolotl and his tank without needing to re-cycle?

Consistency is key Moving fish/Amphibians is always going to be stressful for them. The best thing you can do to ensure that they are stressed as little as possible is to keep the conditions as ...
Henders's user avatar
  • 5,125
6 votes

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

Soda water uses carbonic acid to produce CO2 so in theory it should work, but it is not that easy: carbonic acid is as the name says an acid, and any type of acid will lower the water's pH too fast ...
trond hansen's user avatar
  • 19.6k
6 votes

Help. A common goldfish living in 3 gallon tank

You are trying to do well by the goldfish. But 3 gallons is still very small for a fish. Your best steps now would be to get more information about fishes and aquaria. While the bigger the aquarium ...
Flummox uses codidact.com's user avatar
6 votes
Accepted

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

The pH should not change more than 0,2 during 24 hours. If it is more, it can stress your fish. The goal is to have a neutral pH of 7,0 for most fish, but this is very dependent on the type of fish ...
trond hansen's user avatar
  • 19.6k
6 votes

Can snails and betta fish cohabitate?

This article has several good suggestions for potential betta tankmates. It also mentions: Please remember that the ideas below are suggestions. Your betta may get along just fine with all of these ...
Bruce Kirkpatrick's user avatar
6 votes

Can you use super glue on outside of fish tank?

Common super glue is actually harmless to use on an aquarium, but it might not yield the desired result. This article describes why super glue is safe: Super glue is safe for use in fish tanks ...
Elmy's user avatar
  • 33.2k
6 votes

What could I use to clean limescale off of tank glass?

To clean aquarium glass you can use: A kitchen scrub made of plastic, the ones made for cleaning pots and pans. A paint scraper, you can get this in your local hardware store, be sure you do not ...
trond hansen's user avatar
  • 19.6k
5 votes

Is an UV lamp dangerous for fish?

The answer to your question is yes and no. If you are using UVA light (black light) then this is safe for your fish; most of the light sources used on fish tanks do emit these wavelengths to some ...
trond hansen's user avatar
  • 19.6k
5 votes
Accepted

Will neon tetras eat ghost shrimp babies?

Neon tetras will indeed eat baby shrimp. So they can be used for population control. But keep in mind that you do have to try to keep some of the babies alive. Otherwise you might end up without any ...
Diether's user avatar
  • 1,285
5 votes

Seeking advice on planted aquariums

Dependant on what plants you're looking to grow, it can be a difficult job getting good consistent growth. Firstly, to get your wood to sink, you can boil it which will help it to absorb water ...
Henders's user avatar
  • 5,125
5 votes

Green water in aquarium

As a general diagnosis of the situation, it sounds like what you have is an algae bloom. Algae grows when there is sufficient nutrients and light in the tank which is not being used by anything else. ...
Henders's user avatar
  • 5,125

Only top scored, non community-wiki answers of a minimum length are eligible