Thanks guys, yeah the GHA is wilting away for sure. but, its only doing so on the rock that was sprayed with h2o2. i will wait for the die off to finish before i think about doing my other rock. I'm pretty stoked to be able to see my rock instead of the dang carpet of algae! there is still a bunch of nice coraline one there even. I'll try to snag a pic this evening of both rocks.