Who Gives A Fish Forums

Sorry but I don't think your current stock is suitable for a yellow regal peacock - need to consider water parameters as well as tank mates.

Kribensis Cichlids are actually harem breeders, so they don't really form long-term pair bonds. Adding another female to your tank should be fine, and the male will likely accept her without issue.

A few of mine like to hang out in a tight little group, but it doesn't last long - one of the others always seems to come along and charge them, breaking the group up.