look into trochus snails and cowries. yeah take the imperator back if you want to do any agressive tank. if you want a peaceful take the trigger back, the aint gonna mix for long. as for a 90 lunare wrasses and other wrasses stir the sand good. i think dlight said his puffer stirred the sand pretty well. for tankmates look into lions, wrasses, eels, hog fish and puffers. bo