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I have a well filtered 55 gallon tank. It currently houses a large school of tiger barbs (15 babies) and 4 baby clown loaches (will upgrade tank when they get a bit bigger). I would like to add some kind of sucker fish. I don't know if I should get a Pleco or a school of ottos. If I get a Pleco what kind is best for this size tank? Or should I just get a school of 6 to 8 ottos. I know ottos tend to die off in a month, and if they live past the first month they are usually good to go. So is 6 to 8 enough? Thanks for any info.