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ottos are a schooling fish and need to be in groups to feel secure
although i have seen many people keeping a single otto in their tanks sucessfully
and sometimes people have trouble keeping ottos alive
i have ABN pleco in my 10 gallon and if you are up for the frequent PWC, he is a good algae eater...although most of the people here would disagree with keeping a pleco in a 10 gallon tank
he sure is a poop machine...
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