Flying Foxes (SAE) are the best and are interesting fish. I also have 2 CAE in my 125 that I am not even going to attempt to catch, but would love to have out of my tank. I bought them thinking that they were SAE.
Otos don't eat hair algae and they need to be kept in a group. SAE's like to establish pecking order so getting 3-4 minimum should be fine. You can keep one flying fox as these are aggressive towards each other.