Swany, great display. You've got the kind of fish I would like to put in my tank. I already have two Bala sharks in another tank that I am thinking about transferring to this tank with rainbows. I would also like a Red tailed black shark in there. How do the sharks get along? I'm undecided about which kind of tetras to add first, but I love the Congo tetras. My lfs has a display with the same fish setup you have and they also have two pairs of mild mannered cichlids in with them.