I love that stump. One of the coolest looking Nanos I have seen in some time. If the rams are happy let them be. You keep up on WC's so you should be fine. I am not all about cramming fish into a space they dont fit in but they are small and are displaying great colors so they must be happy. I would just worry about the halfbeaks and rams eating your shrimp. I had a few killies in my mini-m and my shrimp population dropped about half in the few days they were in there.