We've had good luck with our Prizm on our 55 reef, we dont have a lot of bioload as far as a big reef may be concerned (only 'shrooms, zoos, 4 fish, 3 shrimp, 1 crab, and various snails and hermits). Not sure if thats a lot or not, but seems minimal to me. We're trying to add things slowly to make sure everything works well together, just in case theres a problem. We want to add more corals, but trying for easy to keep ones. Anyway, price is lower than some and, unfortunately, it may be a trial and error decision. Good luck!