I think u might have a problem with 6 rams The 4 gbr an 2 bolivians they will cross breed, and 30g might be to small for 6 rams,I would stick to 4 gbrs,I have three in a 35g 1m 2 fm,12 neons 3 mollys 6 Cory catfish 2 bn pleco clown loach,they all get along,it might work just keep an eye on...