My parms were very nice. I never understood why it was only on certain rocks. I tried everything. Running my GFO
helped a bit. But nothing like what results I got from the hydrogen peroxide. I feed maybe every 3 days or so. When I feed its maybe half a cube of frozen food. I stop when my 5 fish stop eating. They gobble it up fast so there is nothing left in the tank. I even tried that Kent Mag for almost two weeks. It helped. But again no where near the results of this. Now my tank looks great. Now my coralline is growing well and no hair has come back. I keep a nice big bottle in my stash. I think I pay maybe $.99 at Walmart.