I'd get him some more nutritious food. Brine doesn't do much for nutrition at all. What kinda flake? It may not have much either. I use Ocean Nutrician's frozen formula one and two on different days. I also use their garlic Formula two (whichever is in the green jar) sinking pellets. Pellets will most assuredly get down there where he lives.
Maybe others have more nutritious stuff to recommend also. I gotta feeling he's not getting fully nourished since he's going after pods
. Mine doesn't look for'm at all. Then again, maybe he's not to leave his post that far since he has to look out for the pistol shrimp. 8) Dunno.