Will these cichlids be ok together?

Tommy, from what I've been told, I won't be able to raise the ratios to one male to several females because I'm doing two pair (one of each species), and my tanks footprint is 36x18. If I'm wrong, that's great, but that's what I've been told. These folks also told me that upper level swimmers like rainbowfish would be a good choice for the dithers, but I'm open to other colorful candidates.

Yes, I always float my bags of new fish and introduce tank water slowly - then put in only the new fish and no water from the store. Thanks for making sure I knew that though!
 
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