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I ma interested in getting a small school of oto's to help out with algae control in my 33 gallon L tank. I do have a few live plants but it isn't quite enough. I have lloked up oto's and have seen that they can get mixed up with juvenile chinese algae eaters at the store. Can anyone tell me certain physical characteristics to look for so I can tell for sure if the fish I am considering is an oto or the other dreaded algae eater? Thanks.