Thanks guys! I am in Happy Frog and it seems everytime I have fed them, they have that over done look. But I am guilty of just following directions on the bottle instead of the gradual approach. My screen is set up in 3 gallon felt pots and all within a single drain talble so that all the access water drains into a bucket in which I can meaasure the outflow of unabsorbed water (20%). I found I was way under watering for a while and getting a heavy nutrient burn which was quickly corrected.