I've got a 16"x12"x12" section in my sump filled with live rock. Detrius collects on the bottom and I can't get it out. What I would like to do is turn it into a fuge. Other than macro and a chunk of live rock what kind of livestock can I put in there? I was thinking a cleaner shrimp, Florida ceriths, cucumber, or something like that. What do you guys think?