[Lsufan]

The rescape may be the reason in the spike of no3. I don’t think no3 at that level would affect acans anyways. Are they the only coral u are having issues with?

It may be some kind of infection that is spreading from acan to acan. May also be something in the tank picking at them, although I think that would be pretty noticeable because they would look like they would be getting eaten

Buffers will raise your alk. Kalk will raise both calcium & alk. What are u doing to maintain your params. If your dosing two part u can replace that with kalk & that may raise your ph a slight amount. Personally, I don’t worry about ph. Ph rarely is a issue & I think most people who think it is a issue for them end up doing more harm then good with buffers. They continually raise alk why only temporarily raises ph.