I have a 20 gallon fish tank, so what kinds of fish or other animal(s)

could I use it for? I need ideas as far as what kinds of fish would be cool to have and how many I could put in it, or what other type of pet could I use it for (lol don't suggest hamsters though)?
I'm guessing it would be too small for a rat, which sucks...anyway, any suggestions would be cool (and links, too). :D
 
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