I have the same problem with my bala sharks. They LOVE zuchinni and when I put some in for my oto's the sharks pig out on it and I never know if the oto's get any. But the oto's are all still alive so.......:huh:
I don't feed my otos anything... they just eat whatever is on my plants I suppose. They're pretty fat as it is so I don't give them anything exclusively. I've seen them munch on some flakes that other fish missed though.