I doubt they will get too big, the Blenny is at max size already, 5.5" and the clown in on his way to 4". I do need more liverock, I was thinking about another 10-15 lbs. It has ~10 already. The main rock and side rock above the HH equal 6.6, and the one the shrooms are on is around 3 lbs. Substrate is a mixture of livesand, and sm/med puca shell, I added that to help buffer everything. Have a whisper 30 on the back, and a 200gph powerhead with sponge for added bio support. It also has a jimmyrigged skimmer, that reads, limewood stone behind filter pad. I want to get one of those prisim skimmers, but dont have 100 to just throw down right now. Looked at my recipts the blenny has been in there for almost a month actually. Time flys when your busy...