i think it is surprising how many fish like to schoal
but here is a selection of some of my faves - if i had enough room i would have about a dozen of each of these..
- as already stated the cory cat fish like to schoal, though mine only ever stick together when there is an algae tab about
- most (if not all) tetras
- harlequin
- loaches
- tiger barbs (touchy one this.. many will say no in a community tank - but many others will say if in big enough group will be ok)
- danios (zebra or leopard are nice)