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I've never had aproblem keeping the two together concerning predation on fry etc. but I imagine they'd be too inactive to really act as dithers. The Apistos do chase them off so they'll act as target fish ok!
I had them in with Blue rams when I used to breed them. They worked fine, though they are a bit dumb. They kept swimming into the ram's nesting zone even though they had the rest of the tank to hang in... but it worked.