Has anyone on the forums had experience with H202 dosing? if so can you let me know 1) at what concentrations? (solution of h202 and to what volume of tank water) 2) for how long? what were you trying to battle against? 4) did you have any shrimp in the tank- especially cleaner,sexy, or peppermint shrimp? What was your experience? Right now i am battling a GHA and cyano outbreak. My parameters are all at 0, both nitrate and phosphate and i am running both a GFO and an ATS. I have increased flow as well, but it is just slowly getting worse. Manual removal of some of the hair algae has been extremely hard as it just doesn't tear off easily.