losthere
New member
SPS need weekly water changes, especially when they start to get bigger. If I go longer than 1 week I can tell the sps arent liking it. I would start doing more frequent water changes. If all you had is LPS, zoas, palys, and euphyllia, your water change schedule would be fine, but sps are far more delicate. I would bet money that it is micronutirent issue. The skimmer and GAC is removing them quicker than you replenish them via water change. Start doing weekly WC's and things will start coming back.