Oto Cats not eating Algae

[VulcanNinja]

I got 2 Oto cats for my 10 gallon when my tank finished cycling to get rid of the red diatom algae. It cleaned that up pretty well, but they aren't touching any of the green algae in the tank. Are they supposed to?? Maybe they are and I'm not noticing it, but I do have quite a bit in there. I never see them eating it. I know they are nocturnal.

If not, is there something else I can get? I'm pretty stocked in that tank, look at my sig.

Thanks

 

[Paul_MTS]

they might be finding something better to nibble on so maybe cut back feeding a bit.