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I juuust did a tank change before this picture so maybe thats why? I probably could use a bigger tank tooIt is a very stressed Gold Spot Sailfin, Pterygoplichthys joselimaianus. When happy, the body is dark chocolate brown to black, with the gold spots and reticulations. I have one of these, and when mine looks like yours, I know the tank is overdue for a major water change.
Does he have any wood to chew on? That could be another reason for being stressed, as they need the fiber. At that size he should already be in a 75 gallon tank or larger, and in the end he will need at least a 125.