They're all looking perky now. It seems the three in the rockwool are getting bigger then the ones in the hydroton stones though. The PH is begining to go up as well. I don't have any PH down yet but I do have some White Distilled Vinegar, how much should I put in to bring the PH down just a bit. The tester I have shows a shade of yellow for 6.8 which is the lowest the tester is made for. I had it so that I had a slightly lighter shade of yellow but now it looks like the PH is right at 6.8.