I have 2 san pedro cacti, one with an arm and one without, and the new growth on both has small black spots all over but the arm is unaffected. I looked on the web a while ago and it said the spots were due to over watering so I cut down from watering daily to every 2 or 3 days but new spots are still appearing and the growth of the armed cactus is seeming stunted. If anyone can fill me in on what these spots are from and how to fix it, please do so.
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