how many fish can you put in a 15 gallon tank?

Answer 1

Depends on the fishes size. 1 inch of fish per gallon of water is the general rule.

Answer 2

As ranun points out theres several, however the point is that water can only contain so much oxygen thats why its calle H2O, various things effect the amount of oxygen in the water however, to keep it simple the most important part for gas exhange in a aquarium is not the filter or bubble wall its the surface area, so if your 15 gallon tank is for aguments sake 18"x12"x12" this would give you a surface area of 216sq inch's. however if your 15 gallon tank was 12"x12"x18" the last number giving you depth top to bottom your surface area would only be 144 sq inch's,
so 216sq inch's would give you a minimum of 18inch of fish to a maximum of 36inch of fish depending on how good your filter was, and the type of fish you are keeping.

If you went for 36 neon tetra's you could well get away with it, however if you put in there a 6 inch Tiger Oscar he would die within the week, so the lesson is stick by the minimum for several months then increase again slowly, if at anytime you hit a problem stop adding and call that the maximum you can get away with.

Of course the above is based on an aquarium of the sizes mentioned you can work out the maths for your size tank by doing as above then dividing the answer by 12 to get the amount of fish inch's your capable of supporting


AJ

Answer 3

The answer is more about how many inches of fish you can put in a tank. I think the general rule for fresh water is 2 gallons of water for every inch of fish (so you could do 7 inches of fish) - remember that they will usually grow, so don't get a lot of tiny fish that will eventually get too big for the tank to support.

Salt water fish are 3 gallons per inch as a rule, but in both cases, if you have good filtration and circulation, you can do more. Remember to take out a few gallons every week and replace it with new water to get rid of waste products.

Answer 4

"Calculating aquarium capacity

An aquarium can only support a certain number of fish. Limiting factors include the availability of oxygen in the water and the rate at which the filter can process waste.

Aquarists have developed a number of rules of thumb to allow them to estimate the number of fishes that can be kept in a given aquarium; the examples below are for small freshwater fish, larger freshwater fishes and most marine fishes need much more generous allowances.

3 cm of fish length per 4 litres of water (i.e., a 6 cm-long fish would need about 8 litres of water).[6]

1 cm of fish length per 30 square centimetres of surface area.[7]

1 inch of fish length per gallon of water.[6]

1 inch of fish length per 10 square inches of surface area.[7]

Experienced aquarists warn against applying these rules too strictly because they do not consider other important issues such as growth rate, activity level, social behaviour, and so on.[8]

To some degree, establishing the maximum loading capacity of an aquarium depends upon slowly adding fish and monitoring water quality over time, essentially a trial and error approach."

Answer 5

This will depend on the size of the fish. I wouldn't put over ten small fish in it or more than two at best larger fish .

Answer 6

3 or 4 depending on size.5 gal= 1 fish

Answer 7

15

Answer 8

The general rule is an inch of full grown fish per each gallon of water! Go to Badman's Tropical Fish and check out the type of fish you want plus lots of other cool stuff. Also please learn about cycling your tank!

Answer 9

5 or 6 depending on what type of fish they are.

Answer 10

the rule of thumb is one inch of fish to one gallon of water so if you have 5 three inch fish thats fine