Another "what fish" question...

[chaibill]

sting rays get too big
i think the freashwater flounder stays small but you need sand.
upside down cats
some of the Badis badis fish
gobys
corys
half beaks
killies

 

[Swayde]

Butterfly fish look really neat, but I don't really know anything about them.

 

[HiImSean]

some bichirs