Refugiums are nice but you more than likely won’t see any benefits with a tank of your size. Your corals look good, even with the amount of phosphate you have. I wouldn’t make any drastic changes here. Like I mentioned earlier, I would watch your feeding and keep an eye on your phosphates. Test them daily to really get a feel for what’s happening. As far as your CUC, make sure you have the right members for the job.