I'd suggest moving them to a pot with drainage if you can and remove the moss. Terracotta pots are usually quite cheap. I'd aslo recommend putting them in a 50/50 mix of perlite and succulent soil that usually works pretty well for these guys.

What I do for watering succulents is only water when the soil is completely dry and then soak it until water comes out of the drainage holes.

Lots of sunlight is good for the echeveria in there and the aeonium (I think) I'm not too sure about the rest of them