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It is H. plecostomus. so will reach about a foot long. They are becoming more common than ever in shops, as they are farmed extensively these days. PlanetCatfish • Cat-eLog • Loricariidae
Yeah, that's the coommon pleco. Put him on some black sand and he'll turn solid for you. With a red or white bucket and the right light they can turn orange to yellow too.