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Go with Cories!! I like the schwartzi or julii.. My son likes to call the schwartzi "black eyed cory's".. I think most all loaches or botia's stay hidden for the most part.. The cories always have a roaming gang checking out the area for food... Also, hugely recommend going with play sand as a substrate for them and most of the others recommended.. It is easier on their tummy and their barbels....
One thing to be careful about with otos, is that if you have any bigger slower moving fish, they will sometimes suck a bit on their slime coat. I had a dojo loach and he didn't appreciate the extra attention.
Yep - yoyo loaches are cool and they do expose themselves considerably! I just ordered five to go with my one I already have but the new ones will be going in different tanks - one with the current one in my 36 gallon - one to my gf - two in my new 20 gallon and one in my five gallon!