Rubber ducky isopods are most commonly found in the wild in areas with high humidity, such as tropical rainforests. They are also often found in areas around bodies of water, such as streams, lakes, and ponds. In captivity, rubber ducky isopods thrive in terrariums with plenty of moisture, so it's important to keep their environment damp and humid. In terms of diet, these crustaceans primarily feed on decaying plant matter and small insects. They are excellent scavengers, cleaning up any leftovers and detritus in their environment.