I am having a horrible gha problem! I cant get rid of it! I manually remove it with my hands and toothbrush. I got a urchin (which i admit is taking out a majority of it). It just seems to grow faster than anything can stop it. I have some nopox i could dose but my nitrates are undetectable. I have been dosing vibrant. I do weekly 20 percent water changes. Should I take out the rocks and replace them? It might be a hard task cause my RFA's foot is deep inside of it, plus I have a huge clean up crew.