So the planning has begun. Tank will be a Marineland 300DD (72x36x27). I'm wanting to design the stock list around a coral catshark (Atelomycterus Marmoratus). Purchase size I've seen most likely will be 8-10". What would be some good tankmates for it? Stipulations would be they would need to stay in the 300 for life, be readily available, and affordable (in the under $300 price range). I would like maybe another sedentary fish/eel (miniatus grouper? Tessie?) and at least one fish that will bring some daytime action to the tank (Lookdowns? I'm not a big fan of them though).