Awww... why did you take them back? I have a Firemouth in a 40g with 5 Kenyis 1m 4f, 4 lemon drops 2m 2f, 4 peacocks 2m 2f, and 5 corys. There is no fighting really, what is even more interesting is that the corys if anything will bully the cichlids on occasion when they are annoyed enough. I also feed them Tetra color, feeder fish, and any fresh marine plant life available at the local pet store. I found that they all became less aggressive/territorial with controlled overcrowding. Added a second B.M.C. filtration unit and there isn't even a problem with cleanliness. pH is set around 7.9/8 with the crushed coral bedding, none of the fish seem to be having any problems what so ever, other than the fact the love reorganizing the gravel at night.