Freshwater Aquariums

Freshwater aquariums are both fun and educational. Questions about the operation of the freshwater aquarium itself, filtering systems, best fish mixtures, and other environmental factors are asked and answered here.

14,063 Questions
Calculus
Freshwater Aquariums

How do you measure ammonia level in fish tank?

There are several simple to use 'Test Kits' available at most pet shops.

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Math and Arithmetic
Freshwater Aquariums

How many gallons are in a 4ft x 1.5 ft x 1ft fish tank?

Based on 1 cubic ft being = 6.2288 Imperial gallons and 4ft x 1.5ft x 1ft = 6 cubic ft then your tank (if filled full) has a capacity of 37 gallons.

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Freshwater Aquariums
Aquarium Fish Species

What temperature should a African cichlid tank be?

76degrees

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Care of Fish
Betta and Siamese Fighting Fish
Freshwater Aquariums

What types of fish don't need heaters?

Sub-tropical and coldwater fish can live without heaters BUT you must note that just because a tank doesn't have a heater in it, doesn't mean it's coldwater! To have a true cold tank you need to install a chiller, which is far more expensive to buy and run than a measly heater!

Fish from all temperature ranges will be stressed out by temperature fluctuations (such as you having the heating blazing during the winter, and air conditioning during the summer!).

What fish you can keep also depends on your tank size. Goldfish are the most common coldwater fish, they also need very large over-filtered tanks. Smaller fish like White Cloud Mountain Minnows and Zebra Danios need to be in shoals in at least 15-20 gallons or more.

Research fish species very carefully!

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Care of Fish
Freshwater Aquariums
Goldfish

How long does it take to clean your fish tank?

Its depend on which fish tank you have small, big. and how fast you are.
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Fish
Freshwater Fish
Freshwater Aquariums
Fish Breeding

Do fish lay eggs from their mouth?

No, they come out of a small tube under their body close to the tail fin called the ovipositor. There are, however, some fish commonly called "mouth brooders" that will either scoop up the eggs into their mouths and keep them there until they hatch or will keep the fry (baby fish) in their mouths until they're large enough to stand a better chance of surviving.

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Care of Fish
Freshwater Aquariums
Goldfish

How can you keep fish tank water cold?

If your aquarium water is consistently too warm for the species you are trying to keep, you can buy an aquarium chiller. These devices cost a fair bit more to buy than a heater, but not that much more to run. The main disadvantage of chillers, other than their expense, is that if you cool the water by more than a few degrees condensation will form on the outside of the glass. Don't use a wooden stand or a stand made of metal that might rust if you are planning on using an aquarium chiller.

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Freshwater Fish
Freshwater Aquariums
Goldfish

Does cold water kill a fish?

Depends on one's definition of cold. If by cold you mean sea-temperature, then yes there aren't many tropical fish who'd be fond of this. If you mean room temperature, there are many fish which will survive and indeed thrive in these conditions. Mountain-cloud minnows are particularly fond of the 18-24c temperature range and should freely breed in this.

If your aquarium water is too cold (20 would be too cold for a lot of common fish like guppies, platys and neon tetras for example) then the fish will be a lot less active in the tank, lose colour and swim with clamped fins.

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Freshwater Aquariums
Numbers

What number is tetra?

The prefix "tetra" is associated with the number four.

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Care of Fish
Fish
Freshwater Aquariums

Is .5 ammonia bad for the water in your fish tank?

Any ammonia is BAD. Your filter is not working well enough. To keep thing safe you will need to be doing some extra water changes (maybe daily) until the filter is working efficiently.

Ammonia should be kept at 0ppm at all time. It is toxic and leave permanent damage to the fish even if the fish survive it. Either your tank has not been cycled properly or the nitrogen cycle has crashed, or you have not cycled your tank at all. You need increase the partial water change to minimize the damage.

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Freshwater Aquariums
Aquarium Fish Species
Guppy

Can you put guppies neon tetras glowfish mollies and platies together?

Yes you can they are all what is known as community fish. The thing is you don't want a bunch of the if you have a small tank.

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Care of Fish
Freshwater Aquariums
Aquarium Fish Species

What age are Platy fish at maturity?

A platy female is at maturity around 3.5 to 4 months old. In addition, they are livebearing fish rather than egg laying.

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Care of Fish
Freshwater Aquariums

What do baby flathead fish eat?

Whatever little crustacea and small fish and insects they can catch.

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Freshwater Aquariums
Goldfish

Do you need a filter for a goldfish pond?

it is always good to get some kind of filter for your fish, but natural ponds dont' always need one. the filters will keep out some bad bacteria though, and keep your fish healthy longer, and allow you to actually see them. goldfish are very hardy and can withstand quite a bit.

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Care of Fish
Freshwater Aquariums

Why is your Dalmatian molly hidding at the bottom of your tank?

The fish could well be getting ready to release her youngsters.

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Care of Fish
Sharks
Freshwater Aquariums

Why do fish swim at the top?

Some fish, like beta's, will need air. They have to get oxygen every once in a while. For lack of oxygen in the water, you might want to consider activated carbon rock pouches in to your filtration system, or connect an air pump and air stone in your tank. air pumps and stones do not oxygenate water, that is an old myth. a bubble moving to the surface only causes water movement, in order to get more oxygen in water you must either have live plants or some sort of waterfall that will break the surface tension dragging air in and allowing expelled gasses to be released at the same time, carbon is a good idea it will grab the excess nutrients that are using the existing oxygen. air pumps and stones do oxygenate the water by moving the surface of the water allowing gas exchange.

The circulation of water from bottom to top in the tank is what causes most of the oxygenation.

Another reason may be water temperature, If you have a large tank, and the bottom of the tank's water is colder then the top, your fish may require a level of heating in the water. I.E. Tropical Fish Tank.

its better to clean the water and add a lil plant from pets at home. or it can be coz they need oxygen or because they're trying to escape from something in the tank, aka ammonia or a different desiese. i could be because they are eating small particles of dust at the top.

Read more: Why_are_all_your_fish_swimming_at_the_top_of_the_tank_if_the_ammonia_and_nitrate_levels_are_ok

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Care of Fish
Betta and Siamese Fighting Fish
Freshwater Aquariums

Does the filter of fish tank have to be always on?

Yes. It not only provides water circulation and oxygen but houses essential bacteria that keeps your water quality healthy. As soon as it's turned off, that bacteria starts to die. The only time you turn it off is when you're doing you're weekly partial water change.

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Freshwater Aquariums
Sharks
Guppy

Do wolverines lay eggs or have live birth?

The wolverine is a fur-bearing mammal, it has live births.

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Care of Fish
Amphibians
Betta and Siamese Fighting Fish
Freshwater Aquariums
Axolotl

Can you put axolotl and betta fish in the same tank?

No, this isn't a good idea. The betta might nibble the axolotl's delicate gills, and a big axolotl could swallow a betta, but the most obvious reason why the two are incompatible is that they prefer very different water temperatures. Bettas are tropical fish that require relatively high temperatures of 25-30 degrees Celsius, whereas axolotls prefer their water cooler, around 15 degrees.

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Freshwater Aquariums
Aquarium Fish Species
Guppy

Can you keep tiger barbs and guppies together?

I wouldnt. Tiger barbs are notorious fin nippers and may nip the little guppy's long fins.

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Fish
Freshwater Aquariums

Do Molly fish give live birth?

Yes, they do give live birth. The fry will be small enough to be eaten by their own mother, so transport them into a different tank right away. Feed them crushed/finely ground high quality flake food, or feed them baby brine shrimp/infusoria, which is preferable. Well Im pretty lucky then because all of my baby mollies survived the adults...

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Care of Fish
Freshwater Aquariums
Goldfish

When a fish dies should you change the water?

Not necessarily - if you completely remove all the water, you could lose most of your beneficial bacteria that helped to establish your tank when it cycled. If your fish died from something parasitic, then yes, you need to clean absolutely everything. If it died due to a water quality issue, then no.

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Freshwater Aquariums
Goldfish

Why is my goldfish swimming in circles?

There may be a water quality issue in your tank. Make sure that you are testing for ammonia, nitrites and nitrates which should be 0, 0, and less than 10 respectively.
If you have readings of ammonia or nitrites, or a high reading of nitrates, you should do an immediate 75% water change. Make sure that the new water you add to the tank is the same temperature as the old water, and be sure to add the correct dosage of water conditioner per the directions on the bottle.

In addition, check the PH of your tank - it should be 7.2 to 7.6 for your goldfish; if it's too low, it could also affect your fish, and the water change should help that as well.

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Monkeys
Freshwater Aquariums

How long do monkeys live for?

15-25 years

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Care of Fish
Slugs and Snails
Freshwater Aquariums

Why do snails eat fish?

If your snails are on your fish then it is a sign they can't find any other food so they are most likely eating the algae off your fish which ends up killing them because it removes the protective slime on the sides of your fish.

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