This may seem like a really dumb question, but what is an otto? I have never seen one(I dont think) and I havent herd of it unil I seen it on this site.
They are great little fish They eat algae - and tons of it. They do much better in groups of at least three, imo, and are a great addition as part of a clean up crew for community tanks.
I have heard on this board of an otto sucking on a pl*co so I guess it does happen. I love my ottos. Need more as I only have 3 in the 50 gal. and they like groups.
tony-da-tiger is that your otto and are those neons in the background? I have never heard of a otto sucking on other fish but apparently others have. I don't think it is very common or a problem.