Things You'll Need:
- Properly cycled fish tank.
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Step 1
Determine what size tank you have.
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Step 2
Forget the one inch for every gallon rule.
If you have a 10 gallon with 10 1" fish, you are okay. However, if you have 10 10" oscars in a 100 gallon, you are terribly overstocked. -
Step 3
Figure out how many times your tank is turning its water an hour. The high the better. This is what you should be looking at when trying to determine a filter.
Keep tabs on your water parameters. If you add another fish and see a jump that your filtration can't handle, NO MORE FISH! -
Step 4
Determine the specific fish's needs.
If it is an aggressive/territorial fish, it needs more room.
If it is a messy fish, you can't have alot of them in the same tank. -
Step 5
Lastly, use your head! Imagine it was you in there.









