mr_X
Aquarium Advice Addict
you can just put a ball valve on it and choke it back at the exhaust port.
Mr x,I think he may be talking about this sump,I personally would reccommend keeping flow very good through any macro's which is why i suggest flow going through macro section to enter low level and exit high level,the cloud i still dont know what it was,cloudy? that's just incredible to me. i've had very deep refugiums with no problems at all. i never had a cloudy refugium. maybe the guy was using reef mud or something, and that was making it cloudy. what would make it cloudy otherwise?