According to reports from aquarists, probably green spot or brown algae. They are found in clear pools with rocky bottoms.
But I think as with other algae eaters, sooner or later, they will prefer whatever food you feed to other fishes.
Fisbase listed their size as 6.2 cm SL but I think may be larger as seen from different shipments. From untrained eye, could be 7 to 8 cm SL, can't be sure. I wouldn't suggest for a tank smaller than 2 feet.
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