Tank looks sweet, i love the rock. One thing I should mention is the crayfish. I had one in my tank with my mbuna, and after a while they realized he wasn't too fast and pecked his eyes out he grew'em back with molting, but now resides in his own lil 5g tank.
well I had 4 crayfish in there when the tank was still goldfish,.. and when I converted to Cichlids I only kept the crayfish in there for 1 day and took them out,... I did not want to loose any cichlids , these crayfish were way bigger than the fish and would kill them off at night if I left them in,... so I took them to the local fish store and traded them in for more malawis 8)