Well I'm no genius on growing pot, but I can't tell you to watch out for the flow of your nutrients into the tub. Make sure it's not too much, and make sure it's not going to fast. Make sure the oxygen flowing in is not too fast to disturb the roots too badly. That sounds like and excellent setup, though. I'm just careful about piping and flows (mechanics). There can be a lot of force generated through those pipes. A gentle streamy flow would be best. You probably have all this worked out though anyways...