Yellow one is an 'electric yellow' breed of labchromis, which is a malawi cichlid. Looks like another couple of peacocks, which would also be from lake malawi. But I dont recognize the bigger looking fellow in the bottom left of your second picture. Either way, synodontii make a good tank made because theyre fiesty enough and dont get picked on too much, and they thrive in the same high pH malawi water that the rest of your tank should have.
Personally Ive used pictus cat fish with malawi cichlids in high ph water, doesnt seem to bother the pictus
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