biggest challenge right now is getting the algae under control. So you know - the joyous experience of lots of water changes. I think I'm done working on the plumbing for a while - as much as I think another closed loop would be extremely beneficial (if cyano's growin - then there's not enough flow! (obviously there's a phosphate problem too) I j just don't have it in me right now to go through that again. Putting the first closed loop in I ended up dropping my canopy while taking it off - still had the halides plugged in - electrocution by halides that are also burning the flesh off your arms is not fun. Drilling through walls is stressful. and I don't fit into my closet anymore. and - oh yeah - putting together 2" unions and valves and plumbing out SQWDs gets costly fast.