Last month...a lot of my softies started withering away...in an unexplained manner. I did the usual obligatory chemistry tests, looked for stray voltage, etc. Over a period of a couple weeks, they got worse. So, I moved all softies except a couple to my frag tank. In the meantime, I sent a sample off for testing (ICP-OES) and it came back with 12 ppb copper...not crazy high, but might account for coral health. Anyway, did a big water change and will have to keep an eye out for it. I checked my heaters and flow pumps to make sure that they are not the source of the Cu.