They are cichlids of lake malawi, and I think both of the genus aulonocara, but they are still too small, to exactly tell what specie may those aulos be.. Wait them to grow up a little more !!!
In pictures 1 & 2 I think those are Cynotilapia afra ´´Likoma`` also known as sp. ´´yellow Dorsal``
3 is obviusly a psedotropheus acei
4. Metriaclima lombardoi