I’d assume it’s algae too, but even if it’s a fungi/mold, most don’t actively attack living tissue (too much of a hassle). I get the occasional spot of something growing in my pots and so long as the plant is healthy it eventually goes away without any intervention. The fungi pop up when conditions are right, eat & grow, then conditions change (including running out of food/material) and they die off or go dormant. If you grow plants you will see this from time to time and 9 times out of 10 it’s nothing to worry about. Watch it and check back if things change.
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