@NickyReefs, just wondering if you have tried BOYD's ChemiClean?Update 2/5
This stuff unfortunately has completely covered sand bed and spreading onto rockwork and coral at an alarming rate. After close to 4 months of testing and almost daily sanbed siphoning...multiple blackouts...uv..h202 dosing..not ONE single sighn of this slowing down if not it spreads even faster. I'm finally decided to throw in the towel. I can no longer spend an hour a day working on this tank. I want to thank everyone for giving me input and spending time trying to help.