The second picture is a firemouth. It's a new world cichlid.
The yellows are Lab. Caeruleus, or electric yellows, an mbuna from lake malawi, Africa. The blueish ones are also mbuna of some type (was the bottom one fat like that when you got it?
The two types (new world and mbuna) have different behavior patterns, diets, water preferences, and most importantly, behavior patterns. It's best to choose one or the other. Even if it 'seems' to be working now.
Lose the firemouth and you've got a nice Mbuna tank started. Those rocks and decor create a perfect environment for them too. There's an artical pinned if you're interested in learning more about them.
If you've found yourself attracted more to the firemouth I can give you some info on that, and it would be best to go the other way and lose the mbuna.