Am still using sugar size sand in my high flow SPS system. The system is 110 galling long tank w/6 power head 4 evo 4 koralia + 2 tunze 6045 modified + 2 clown fish + 2 wrasse. Does it work yes! Would I do use sugar size sand again no. I used it because I like the look!*
I do get the occasional controlled sand storm, but it never seem to bother the SPS, I always have full polyp extension even with the sand storm.
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