aqua_holic
Aquarium Advice FINatic
I second the crayfish idea - kids are fascinated by them. But you would only need a 20-29 for that.
BGK is an awesome fish but it is purely nocturnal, so not much fun.
Severums are great fish too - a little quarky, but nice fish you can keep in a community tank.
Pearl gouramis aren't very interactive with the outside world, but are plenty interactive with each other. My 5 are almost always together.
Great thing about oscars is how fast they grow, so you won't have to wait a long time for the fish to get big.
Goldfish are a great choice for such a large tank too.
BGK is an awesome fish but it is purely nocturnal, so not much fun.
Severums are great fish too - a little quarky, but nice fish you can keep in a community tank.
Pearl gouramis aren't very interactive with the outside world, but are plenty interactive with each other. My 5 are almost always together.
Great thing about oscars is how fast they grow, so you won't have to wait a long time for the fish to get big.
Goldfish are a great choice for such a large tank too.