Personally, I've noticed that petro's grow the best for me in some pretty dirty water. They don't mind tons of light - I've had mine in everything from 8 bulb ATI, center tank to 3 Radion G4 pros + 4 T5 supplementation. Last time I checked my nutrients, I was sitting at 25+ppm NO3 and didn't even bother with my PO4.
I’m at six now. It’s been a rough month. I keep coming home and finding this frag on the sand or in one of my hammers. I finally took the rock it was on and glued a frag plug to it so that it stays in the rack better.