I'm looking to add more fish to my tank (120 x 50 x 70), and am hoping for suggestions on what would be appropriate. At the moment I have 1 leleupi (around 4 years old, and very dominant!), 1 cylindricus, 1 syno multipunctus, 2 calvus and 1 compressiceps. I do weekly 60% water changes, and my parameters are zero ammonia and nitrite, 10-20 nitrate (same as tap water), pH 7.8 and kh 14. I have tried adding a group of 8, 3 inch cyps (approx the same size as the leleupi) but within 10 minutes the leleupi had one of their heads in its mouth and I had to remove them. Do you think it would be ok to add a group of 3, 7 inch fronts to this tank, or is this tank not really big enough? Do you think there would be aggression between any of these fish? Thanks in advance.