I don't personally use Rockwool. I use Oasis Cubes and my system is a bit different than yours....I would recommend Oasis cubes due to not having to worry about PH fluctuations...but thats just my personal experience and opinion. I get 100% success rate so if you have them available to you...try the oasis cubes...I think they may also be called rapid rooters. Hope this helps.
__________________ GrowerWannaB |