ZZs are usually very easy to care for. In fact, they do well in just about any situation, but not a lot of direct sun. Did you add perlite to the potting soil? I know its
cactus soil, but still.. some of them are still too "rich," and I always add perlite. I water mine about once a month except when its super hot, then maybe twice a month. Make sure the pot is not too large for the plant. It should only be a little bigger than the root ball. If the soil is dry down to your second knuckle, it should probably be watered. Water thoroughly and then let dry out again. ZZ plants respond well to very little care, and I think they are very attractive, although they do not
flower.