I just moved 8 clones from my humidity dome to their finishing spots in a top fed system. I have 4 plants in each tub with small water lines running to each basket with hydroton rocks in them. My nutes/water solution is being recirculated and I am running my pumps and air pump 24/7. There is a nute build up that is happening in the water lines that are running to each plant. is there any way to prevent this? I have large air stones in the reservoirs to keep things mixing. Does anyone have any suggestions for this and so far its not effecting the water flow but I fear it will soon. Anything helps.