Connie,
I have one other piece of advice, I may of gotten confused in all the posting, but if you are running any kind of filtering in addition to the skimmer and BRS GFO/carbon. ...get rid of the filter system. With a good refugium and sump, you DO NOT need nor want a filter of any kind, IMO all additional filtering is going to do is add maintenance chores and cause trapped nasty spike causing problems. .. and I think the filter most likely is/was your problem.
IE: My display tank is a 90. I run a sump, skimmer, two small (a 20 and a 10) refugiums, and almost never need to turn on my GFO/carbon, ... and I feed heavy with frozen coral and fish food.. and... plenty of phyto. I use heavy lighting over my 10 gal refugium and run it at night when the lights to the DT are out. My 20 gallon refugium is a display refugium idea I am testing and has the lights on the same times as the main display. My coral are healthy (as is everything) and my tests are rock solid. I dose Reef Fusion's parts 1 & 2, Kent's iodine mix, and Brightwell's "Replenish". I also dose Brightwell's "Liquid Reef", but am planning to nix it, soon, maybe today, so don't count it
If you decide to do the heavy feeding method you will have to get your tank stable first. Then you increase the feeding volume in tiny increments over a few weeks. This allows the bacteria to grow as you go. Once you get to where you are feeding heavy you will find out that with full time skimming your tank will have more nutrients and will be rock solid stable. I believe the stability is from the buffers provided by the increased bacteria count. Now, realize if you do this you must feed heavy consistently or you can kill off bacteria and inflict a reverse crash bloom. Suddenly decreasing feeding is just as bad and suddenly over feeding in that respect.
Don't do this but do read it: I now only change my water once a month and am on 5 weeks with this change. If I can use this method, AND extend my water change time, then I am proving that this method can work even in those cases where people are delinquent with water changes. To do this you must export algae, and add trace elements. Please realize, I'm experimenting with adding traces, exporting algae, and extending water change times as an experiment. But the point is, it proves even more so that it works. Let me clarify, I recommend you do, do regular water changes.
(I would like to prove we have the additives and skills and methods to not do water changes, but it is way to early to even pretend to assume I can do so. I know there is a group of reefers who use algae scrubbers and no longer do water changes... but before I will do that I must prove it for my self. Plus, I want to prove it is not necessarily dependent on an algae scrubber. So, I am slowly increasing water change times with a water change tank ready to do an emergency change at any time.)