Not sure 100% of what this is, I kinda think its fungus, but it doesn't have the puffy fuzzy stuff just looks like white patches on the pleco's skin. Any help is greatly appreciated!
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About two weeks ago my pleco got stuck in one of my smaller cichlid caves, I had to physically pull him out. The scrapes on his belly and sides looked exactly the same as those ones do on yours. Could be a possibility he hurt himself accidentally. With mine I just put a little salt in the water whenever I did a water change and he is almost completely healed
Just some aquarium salt?