I don't even have my tank yet, but thinking about picking up a mini BRS reactor and packing it half with Carbon and half GFO. The Reefer 170's sump doesn't have a dedicated fuge area, but might be enough space for me to stick a ball of chaeto into. It just won't be rolling and I'll probably have to get a light for it. I just dislike all the algae growth that might get into the sump with that light. I'm considering just putting a DIY macro algae reactor together, or plumbing a small fuge on the side. Anyway, I've never NOT had phosphate issues, so I'm thinking of either just dealing with constant GFO media changes (pricey, but probably pretty effective), or wondering if a chaeto reactor or something would be even better (probably less pricey, run an LED strip light, give away chaeto balls and get some karma points). I used to run GFO in bulk from BRS, and it helped a lot. Though my skimmers never really pulled any skim (just overflowed every few days). So this time I might be in luck. Long question short: would you run GFO or chaeto? Both?