We have a very nice Elegance which has been a picture of health until about a week ago (don’t have a pic of the change). It had been moved due to our Bella Goby digging it out and needing to return the sand into place to put it about where it had been prior. It has always tolerated sand being “processed” by the goby and falling onto it without the slightest retraction or change. (Just mentioning all this to ensure I’m hitting all possibilities that I can think of.) Phosphates have been my personal challenge since establishing the system a little over a year ago. I recently had been dosing TM’s Elimi-Phos Rapid (Lanthanum Chloride) after giving up on my stupid GFO for consistently clogging my media reactor in about a day. About a couple weeks after starting the Elimi-Phos, the Elegance has decided to retract almost completely, with no observable improvement over the past week. Fortunately, there doesn’t appear to be even a hint of necrosis (yet). I had thought I was being extremely cautious with the dosing, deciding to dose 5ml over about 10 minutes morning and night with an insulin syringe. I’d estimate I did this for around 2-3 weeks, on occasion missing one of the doses daily. I know nitrates can impact phos levels, but that has been fairly stable at 10-15. The phos had gotten as high as .52. Since starting the Elimi-Phos, the lowest measurement I got for phos has been .32 (but was slowly trending downward). I’ve done 15% water changes every 2-4 weeks since establishing our system. We have a mixed reef of SPS, LPS, and a couple softies. All of them have continued to look really pretty great throughout the addition of the Elimi-Phos. Also, I need to mention I haven’t dosed again since becoming concerned a few days ago. Anyone else have a similar experience? I have been unable to identify any other culprit.