I would do a fishless cycle, then add all the fish at once. Thats what, i did, and i didnt hurt one fish, and never saw ammonia or nitrites with the fish.
I would get anything else on the floor level with those rams in a small tank like that. When they spawn, they get aggressive and will probably kill the ADF. So IMO, get:
5/6 Bloodfin tetras
Pair of Rams
3 otos