They also have CRS at my lfs... Those pelvachromis are lookin nice too...
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I'd skip the Laetacara and be careful of the Pelvicachromis types just because of the tank size. While that size tank would easily house a small pair of either, there's not much room for them to escape each other if things go south. I successfully kept Laetacara dorsigera in 55 gallons+ and they spawned everywhere, but when I separated the pairs into their own breeding 20g, the males of both pairs destroyed the females while I was out one day. I lost one female and the other never regrew any of her fins. I'm not sure what caused them to flip out but I actually had better luck just letting them spawn in a larger community setup and removing the fry.
I have Enigmatochromis lucanusi (aka Pelvicachromis sp. 'Blue Fin') growing out and ran into the same issue -- the sub-adults were beating each other up in small species tanks, but when I moved them into 55 communities with other small, peaceful fish they calmed down and quit harassing each other.
I've definitely bred kribs in 20 longs in the past but I'd just make sure you had a really good bonded pair before moving them into a smaller tank by themselves. Another option may be to keep a small group of tetras with the pair to deflect some of the potential aggression. Not sure if that'd stop them from going at each other, though, if they had a falling out.