03-05-2012, 09:58 AM
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Most aggressive fish get large. But you do have some options.
The first one that came into my mind was a betta.
If you planted the tank very, very, very well, you could even do a sorority. Which is a group of female bettas. They are pretty impressive, but require lots of plants and "hidey holes"
Next that came to mind is some Gouramis. Yet some get pretty big, so if you get one stick with a dwarf, or honey gourami. (Not too sure how aggressive the Honey's are.)
A Cichlid can be quite aggressive, though I'm not too informed upon these.
A Dwarf Puffer would look very cool in here. Not sure what their main diet it, but I know they really enjoy snails.