I can't stand the stuff, lol. I had to clean it up out of a 55 gallon at the lfs once, and after 2 hours, a clogged canister, and a clogged Python, I'm pretty sure I was having blood pressure issues. The shop tanks use HO T5s so I know lighting wasn't a problem. We haven't ordered it since and I refuse to even try it in any of my tanks, lol.