update!!! the bloke at my lfs is gonna get some in for me for £3 each!!! and he is doing them slightly cheaper if i buy a decent amount!!!!! yay!!!

Dreamsing;3994386; said:of course, if you are still interested in aggressive fish that will work in that tank ... green spotted puffers (brackish) are smart and aggressive. I think you can have 3 in a 55 without them picking fights. there is also my personal favorite of dwarf pike cichlids. most of them max out between 6 and 12 inches. entertaining eaters and can also tell the difference between individual people. you also have the option of snegal bichirs for that tank (12 inches) you could keep a few of them.
i'm a fan of a smaller number of bigger, smarter fish as opposed to schoolers as well though. in the end it's your tank and i'm sure it'll work out well.
