I have recently got a new red sea max 130d and thinking of just stocking it with just sps but I would still like a few fish and shrimp etc, is this wise or should I keep it a coral only tank? All so I was wondering what would be best to put in the built in sump area at the back? Should I stick to the standard filter media, ceramic rings etc or should I go for something abit more natural eg LR rubble? Any help would be great 