1. Chindongo (once pseudotropheus) Demasoni
2. Melanochromis, maybe Auratus male, the head shape doesn't look like Chipokae but more blue than average for Auratus
3. mbuna, not sure, next to a common Pleco that hopefully is alive
4. OB Zebra, hard to tell if that is male or an Estherae... those are often vague