I believe he uses skimmer, ca RX, and the Korallin Bio-Denitrator. Could also have a fuge in there, I'm not sure. Brad, I was wondering if you could give me some advice? I am strongly considering getting the Korallin Bio-Denitrator for nitrate removal. I've never used a Sulfer Reactor before. What's your verdict on the Korallin reactor? Is it pretty maintenance free? What work goes into running it, and have you experienced any issues? Pros/cons and anything else about it you can think of? Thanks, I really appreciate it. I've been looking for someone with experience with this reactor to bother with questions so I really appreciate any help you can send my way