Interesting, I had this problem as well earlier this year. Just the tips were affected and I noticed on a couple of corals that I accidentally brushed up against that the tips were very crumbly not hard like they should have been. I also noticed that if I broke the tips off just to where the tissue was they'd heal up pretty quickly but then later on other ones would have the same issue. I can't remember what I chalked it up to at the time, low alk perhaps. Never thought of potassium but I think I might get a kit just to scope it out even though I'm not having the issues now.
I did add a bucket of Seachem into the mix at some point after this happened, maybe it has better K+ levels than IO on its own.
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