I have the same system as you do and if you have read my stuff about rock wool cubes and root rot then you know that I have had problems. So far with this system I have also made the trays at a slant and I have taken off the drain system and put a new one on that I can take apart and clean. Keeping the thing clean and sterile is important, I found out the hard way and have lost about 6 plants. I thought that I had it cleaned but it wasn't good enough. The system is pretty good, I did have two very successful crops and with the help of all the wonderful people here, I have learned alot and am starting all over and hopefully this crop will be great. Good luck to you. Willow