I have a 4 month old 72 gal bow front tank, small gravel, petrified rock, lots of hiding places, a few plants, good filtration (fluval 405) and flow (two mini jets 606 powerheads). Rift lake like. I orginally put in the plants and 4 yellow labs (malawi) for cycling purposes, after 8 weeks added two Travaswe "marmalade cat" 1 M and 1 FM (malawi). Yesterday, I added 3 Tropheus Moliro Red about 2 inches each and 2 Kaiser IIs about 1.5 inches each. I also added one 2 inch young pleco sailfin gibbicepts (for algae, which i am regretting a bit now). I want to keep down the aggression with the tropheus or any other problems. are 5 tropheus enough or do i need more? none are sexed yet. If i add more, how quickly? since i have been told that once a colony is established the new tropheus may be killed. any help. tips on the tropheus and entire setup?