A 10 gal is too small for a bristlenose. Otos prefer to be in groups, while one would fit in a 10 gal, a group will not. What else is in this 10 gal with the algae eater and cory cats and how many cory cats? A couple of applesnails may work for algae control.
I would also suggest you return the Chinese algae eater and I'm pretty sure that's what you got stuck with. I wish they would stop selling them. Grey in color with small dark spots along the side of his entire length and a suckermouth. If that description fits, he will go crazy in a 10 gal tank and take it out on anything he comes into contact with, the corys being bottom dwellers will take the lion share of this aggression. I have one that became aggressive in a 30 gal. I bought a 15 gal for him and added 3 dwarf puffers and I see he is not happy in this tank. While he will not hurt the puffers, I still feel for him and will move him once I have space in a larger tank for him. But it's his own fault he is in the 15 gal. His brother/sister is a 75 gal tank and behaving very well.
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