Sorry Dejayou, I run a dip system with Rockwool. Everyone says don't use Rockwool as a medium but I haven't experience any proplems. I run my pump for 10 min every 3 hours. Then cut that back in half when the lights are off.

I'm sure this doesn't help you for your application but didn't want to read and not reply with what someone was doing. Good luck. :thumbsup: