Just read through all these post and I can sympathize with you. I've combated red slime and hair algae. It's truly a pain in the backside and I can see why lots of people let it beat them and get out of the hobby. As someone mentioned most of these issues are caused from bad water, to much light or maybe time to change the bulbs, bad flow or the most common, to many nutrients. Chem clean or Red Slime algae remover does work but you'll have to take out your carbon and turn off your skimmer. Be ready when you turn your skimmer back on it will go crazy.
Remember the only thing that happens fast in a reef tank is death.... Take it slow. Red slime will still grow without light. Chem clean is a good start but remember it's a band aid. Good husbandry is the key. I only saw results after I got back on track with my cleaning scheduled. Also if you've got algae it can skew your p04 and Nitrate readings. I even sent water off to have it tested and all came back good. Keep your skimmer working good and make sure the pump is clean and pulling air like it should. Skim wet till you get rid of this problem. I run carbon and GFO 24/7 and bio balls but it was only after weekly water changes and sand vacuuming that I saw results. I cut back on feeding and have stuck to a scheduled and I'm now seeing results. Its taken about two months to get to this point. Take your time and find the cause or you'll always be fighting this issue. Good Luck