Ive only had green spot algae on my glass occassionaly and never on plants, is this what is growing on my Anubia leaf ?
If it is then why is it only on this leaf and none of the others (15-20 leafs total)
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It sure looks like the same stuff (GSA) I had on my anubia. So I am going to say yes you have some GSA. I only had it on like 3 of 15 leaves, my guess was those 3 leaves had more direct light. Nerite snails took care of that for me. Since then I've corrected my phosphate levels and it hasn't come back.