Russ0r was only telling me the other day how much he now hates foxfarms in hydro.
He was telling me about how it "gunks" up his res and means he has to clean his tank more often.
I personally use ionic grow bloom and boost and am really happy with the nutrients, it was the third brand i tried and I've stuck with it since, it isnt organic but it definately works well in hydro. + the tank stays pretty clean for longer