You SHOULD be getting runoff in soil (peat based)... only thing I've found is that after GH Trio sets for 24 hours, the PH spikes from 7 to like 8.8. I don't know why, but it does. So, I just dump 20 gallons of runoff out of 100 that I feed in. This is why if I have 5-10 gallons in my rez after feeding, I'll pump it down the drain, and flush the tank for the next days feeding, and start fresh again.