WOW!!!! I guess that all the emailing and peoples expert advise and pictures with years of success built into them lead me to say that species mixing is o.k.. I have a 37 gallon with an eclipse 3 hood modded to fit two 65wt p.c. with fan. Corals; star polyps, zoos, mushrooms, ricordias, xenia, purple gorgonian and of course live rock. Fish and critters; yellow coral banded shrimp, a few pepperment shrimps, six line wrass, mated pair of green mandarins = 15 months, one each of gobies= yellow, green clown, pair of yashia w/ shrimp and black, purple fire fish. Critters; lots of tiny blue leggs, misc. snails. This system with the two female Kelloggi is going on 21 months now with no problems. All is healthy. Proper maintanance is done daily, weekly and monthly to assure a proper healthy environment. I educate myself extensively BEFORE and throughout ANYthing I do, like everyone should.......