Add metasorb, cuprisorb and if you don’t have those on hand make large water changes. Keep track of alkalinity.
Then try to figure out the source of copper - corroding metals etc
So how did your ro water test? I would check every piece of equipment. Water changes and cuprasorb. I have cuprasorb running at all times. I just had a magnet on a probe holder blow up. For how long I don’t know, but it was a mess. My cuprasorb saved my sps I’m certain.