Your question is vague and you have included zero info about your tank, the kind of fish you want, etc. So right now, your question is completely useless.How Many Fish Can I Keep in my fish tank?
So I can keep a 12 inch oscar in a 12 gallon tank? Awesome!A general rule is 1 inch of fish for each gallon of water. 4 inch fish = 4 gallons of water.
I think this is a little too liberal. I have a 90g tank, but I certainly don't keep 450 tetras in it.For small fish like glo-light tetras you will end up with something like this, 1 1/2"x 1/4"x1/2", this comes to 3/16 of a gallon (about 1/5), and that gives you 5 fish of this size per gallon (quite reasonable)
I do not think anyone was trying to "flame" anyone here, it was just that the question was so simple and it was obvious little attempt was made to use the search tool or read through the archives for an often asked and many-times answered question. Very nice of you to take the time to repeat it all here for them. But it just encourages people to just keep taking the lazy route! :bounce:I found this! helped me understand.
The "one inch per gallon" rule
This is something that comes up fairly often and is rather misunderstood therefore I will attempt to clarify the original meaning of the general guideline of "one inch of fish per gallon of water".
This is a suggested guideline for a well maintained and filtered tank.
It does not apply to all fish as some have differing requirements.
Here is the part that is being misunderstood.
The "rule" does NOT refer to the length of the fish!
The "rule" applies to the cubic inches of fish in the tank.
This means that a 5" gourami should be measured in this manner,
length overall (5"),
height, (2 1/2"),
so for this fish you multiply the following, 5x 1/2x 2 1/2, this gives you a total of 6 1/4 gallons of water.
For small fish like glo-light tetras you will end up with something like this,
1 1/2"x 1/4"x1/2", this comes to 3/16 of a gallon (about 1/5), and that gives you 5 fish of this size per gallon (quite reasonable)
For larger fish you end up with something like this, my example here will be a silver arowana at 24" long, 24"x 4"x 1", which gives you 100 gallons of water.
As you can see this works fairly well.
You do also have to apply some common sense and allow for such things as potential growth, the fish types' tolerance for crowding, and of course the width and length of the tank (a 24" gar will not work in an 18" wide tank even if the tank holds 100 gallons).
So please people, accept that this is just a generalized guideline to figure potential stocking levels, not a hard and fast rule.
Also remember that just because you don't like it doesn't mean you should slam somebody for using it.
And lastly, please don't flame someone by saying a 10" oscar doesn't fit in a 10" tank.
Of course it doesn't,
but the rule never said it would.