Oh, check out this photo, most of my rock wool blocks have roots coming out the bottom. I am wondering if I should get one bag of those orangish little round clay pellets, and put maybe 2-3 inches of those in my grow tray. And if so, how much more work are they? I have never used them either.

I kind of like it this way, because I can move the plants around the tray. I ment to go bigger, I just did not know I went big enough to get like 12-16 plants in there. 12 would be nice, 16 I think might get tight. My grow tray is 3'X3'