I have a pair in with my discus and there is no problems and as far as feeding I only have 2 redheads with 9 discus and most of my discus are bigger then my pair of geos so everybody gets there fair share of food so I'd say you okay with that mix just narrow it down to less geos like you said and you should be okay
Here's my male hanging with some of the discus after I feed them you can see the females mouth behind him they go great with my discus
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