I am going to let the chemiclean run its course before I try anything else so I dont put to many what ifs in the mixI have tried h202 dosing at 1ml per 10gal and it did nothing to it. I can't remove the rockwork because most of it is glued together with epoxy and reef glue. I will try scrubbing with a toothbrush dipped in h202. A lot of rockwork being a 125. I sometimes wonder if my rocks are leaching stuff. I started with dry rock this time... Instead of live rock. I started with live rock in most of my tanks in the past.