Hey dude, I had the same thing happen to me a while back due to a spike in alk. I went from 7-8 dkh to 11dkh and right of way I lost 4-5 colonies. IME and also a few reliable sources, when running the pellets I try to keep my alk arund 7 ish, just like all the other probiotic system(zeovit, prodibio, etc) once your no3 and phosphate are getting close to zero with an elevated alk levels it is much easier to bleach your sps. Also I think if you have a good habbit of keeping your water prestine condition, not overfeed and over stock, I don't think you shouldn be runing pellets. I have quite a few fishes in the tank and I like to feed heavily so the pellets really keep things inline for me. I feel that if some thing is working for you there is no need to change any things.
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