Currently in my 55 gallon I have two 3" clown loaches( being picked on in my other tank by some larger fish even though they were with the other 6" plus clowns) 5 swordtails and 10 neon tetras am I fully stocked?
Ah, so it's a growout?
Once those are gone, you could add a school of say, panda cories (any cory that is OK in cooler water as neons need cooler water). I would do 12.
Then I'd say you could add a pair of rainbow cichlids.