If you Google query for Predator tanks, you will find Clowns and many other fish are added to predator tanks. Just have to be bigger than the Predators' mouths and be somewhat aggressive themselves ( clowns are semi-aggresvie).
Clean-up crews are more challenging. CUCs seem to be safe enough. Some crabs or ok, but most of the other "normal" cleaners are food.
Other issue I have read about is attempting to feed on some schedule / food type where only some fish eat each day. This is done to limit the waste generated at one time as the biological filtration will have to deal with it ( since other clean-up crew are not possible ).
I read most handle the waste by oversizing sumps, skimmers, etc. Some of these fish shed a protective layer and need a high-flow area to assist, but it does not seem the whole tank has high-flow. Intense lighting does not seem to be necessary as most folks seem to recommend softies if there are any corals in the tank.
Will be interested in following along as you complete your build. I have a 56G I will be setting up as a predator tank shortly ( after I get done installing the wood floor in the room ( well, if ever get off my butt and actually start on installing the floor i might get it finished and then get the tank up)).
Interested in hearing from others who have this type setup.
