well i finally got the custom built 30 gal refugium /ecostem to go under my current 55. water from the tank flows through a small bio ball area to break up organis then enters into the refugium area that i belives is about 20 gal. the water then overflows into an air trap section then into the in sump pump section then back to the main tank. I am currently awaiting the miracle mudd before i place in the calupera. my question is what type of lighting will be ok and also do you mix the miracle mudd with other types of substrate ?? i would like some type of deep sand bed about 4" if not alittle deeper. also i have read that people on this board still run uv sterilizers and skimmers with their refugiums, i took all of those devices out what are the pros and cons. A freind of mine has an ecosystem on his 240 for about a year and it looks great. also he said it was more low maintence, as if there was such a thing in this hobby...but any input from those of you with ecosystems or that have tried them would be appreciated.