Quote Originally Posted by Weedhound
Also...next time you flush....don't put the same water you are flushing with back in the system (maybe i'm mistaken but that sounds like what you did.......) Change the flushed water out for new solution w/nutes.
I should have been more specific, I changed the water after the flush. Here is the GH instructions that say to run on a timer like I have been. I dont remember where I got the idea weeds werent water loving plants but I guess its a possibility.