I use it in my 230 and I don't know if or how it works. I have 2 tangs - a hippo and a yellow and both have been very healthy for over a year now. No sign of ich or HLLE which this system is supposed to help with. My tank is healthy and everything is growing and doing well. I have a friend who has been running MM system in his system for about 6 years and it is one of the nicest softie LPS tanks I have ever seen. Also has one of the largest and nicest Sebea Anemones as well. The only thing I have ever know him not to be able to keep was clams and I can't figure it out because he has good water quality AFAIK and OK flow. The only thing might be calcium. Anyway I am happy with it. I can't take pictures right now as my camera is not cooperating with me but it is a basic sump/fuge. I light 24/7, have about 40 lbs of live rock in there as well and a whack of Chaeto that I am constantly trimming back. It is a 77g sump/fuge that was made at AI in Edmonton with 3 compartments and baffles in the middle where the fuge is. HTH
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