Any reason for running that skimmer for only 4 hours? I think that many people would consider that skimmer undersized for your system even running it 24/7. At 4 hours per day, its not really doing much for you at all. For the other 20 hours, you have water sitting in skimmer body getting nasty, while the skimmer neck is letting a dry film build up that will decrease performance. In a sense, it will take four hours to clean the nasty water within the skimmer and to "kick in" for the rest of your 400 gallon system. This undersized skimmer at 4 hrs per day are why your phosphates are sky high and therefore a possibility that there is no polyp extension. There are other possibilities such as red bug , etc .. but phosphates would be a good guess. youre at 1.0.. 0.1 is considered high. A good target is below .05 and most strive for .o3. I would continue with some phosphate media in the reactor, but I would look into a ferric oxide media. and if you really want to pull the phosphate down, go for Phosar HC. Most of all I would keep that skimmer running 24/7. I would be cleqaning any filter socks/sponges every other day, or better yet, dont use them at all if your running a natural system (DSB, etc,,)
Good luck
