Siamese algae eaters are one of the best and most elusive algae eaters available. They are they only fish that will eat red and black algae but you can never find them except online. The ones sold in pet stores are usually chinese algae eaters, false siamese algae eaters, or flying foxes. None of these species do a good job eating algae. I was at Petco the other day and in a batch of black neons were three true siamese algae eaters. The clerk even argued with me at first saying they were black neons even though they were 3 inched in length and clearly an algae eater... (sigh). I got two for the price of two neons. They are doing great and my otos try to school with them.