You might want to send off a water sample to Triton for analysis, just to rule out anything weird. I had been having trouble keeping SPS alive in a fairly well-established tank where my parameters were really stable and the softies seemed fine. The SPS would just stop extending polyps, and gradually dwindle and turn white and die. I couldn't figure out why and it was driving me crazy. Got my Triton results back and it turned out all my numbers were fine except Chromium, which was off the charts (way into toxic levels). The tests cost a little money but probably less than what you've spent on frags that have died, so at least worth a try.


