They are very good parents after the first spawn or two, sometimes after the first spawn. They become very territorial and aggressive. A pair can dominate a 55 gallon tank of less aggressive fish. Ya should have room for two pairs and the other fish in the 125 as long as the pairs aren't too close to each other. Ya may move some branches, rocks, or other decor items around the pots they've chosen to hole up in to limit the breeding pair's line of sight and thus reduce their aggression by limiting their view of who is getting close.
The fry are easy to raise. I've never made special attempts to raise the fry. I always just feed the fish normally.
WYite