Recommendations from LFS

After losing the Frogspawn Coral (Euphyllia divisa) and Indo-Pacific White-Striped Cleaner Shrimp (Lysmata amboinensis) within 2 weeks or so, I spoke with a couple guys at the LFS, who have these recommedations:

• High-ish (1.027) Salinity isn't really a problem, unless its over 1.035, or it varies quickly
• The use activated carbon, or PolyBio Marine Inc.'s Polyfilter, even though my measurements are excellent, as a sink for the biological chemicals the Mushrooms and Corals emit, which could be chemically "burning" some of the other inhabitents.
• Warned against back compartments filled with LR w/o light, as a haven for bristleworms, could add light on back, and also need bigger pump as it creates lots of resistance on the flow.