I've been starting to agree with BRS videos- PH is really important and it affects/determines growth rate.At least you guys can grow the stuff. Seems like the one thing that'll never grow, I'll have pieces in my tank for year or two and I never notice growth. I guess it does grow but it's always bare Skelton under the heads and slow as a snail. I think I need moar lamp/give it some waves or something. My icp test came back pretty solid. Just low potassium witch is fairly important but still...