snakeheads? not sure which; but heard they are great to keep
ermmm, a huge tank with dwarf puffers
or a tank with:
Rummy nose tetras & any other type (you could have 3-4 types) like silver tip and cardinal and xray or phantom
BN plecos
German Blue Rams / Gold Rams / Long Finned German Blue Rams (a Pair)
a few SAE's (i like them, just preference)