The larger fish looks like it could be a young convict, but the smaller looks like a young Kenyi cichlid. Convicts are C Amer cichlids, Kenyi are African cichlids from Lake Malawi. Convicts are known for their aggressiveness while breeding, but Kenyi is aggressive most of the time. IMO, it's best to not mix cichlids from different areas, especially continents. I would choose which one you like best, rehome the other, and try to match tank mates to the one you keep. If your Kenyi is male, it will eventually turn yellow, just so you're aware.
Although, it won't hurt to keep both until they get a bit larger so you can make a positive ID. Aggressiveness won't get bad until they're at least partly grown, and it's entirely possible that I ID'd them incorrectly.
