I suspect this one. Your latest pics look very much like damage from amano shrimp or possibly SAE.I do have a single SAE
Just algae wafers. I've tried Zucchini, but they don't eat it.I suspect this one. Your latest pics look very much like damage from amano shrimp or possibly SAE.
Pleco, oto or snail damage shows up more rasp-like.
Did you substantially increase feeding? Any vegetables?
One of those, Clown Plec would be my guess. That is definitely grazing damage.I do have a single SAE, Clown Plecos and Oto's
I'm assuming <"they've got some wood">? If they have, you could try Yam or Sweet Potato?Just algae wafers. I've tried Zucchini, but they don't eat it.