I live on Oyster creek,NJ. Oysters are difficult. They need water that has a lot of shmutz in it. I have tried oysters, but have had water that had made them shrink. I show them back into the lagoon. Filter feeders are sometimes tough. I have kept regular clams and mole crabs alive for years in my tank. For some reason, oysters I have to throw back before they starve. Protein skimmers, especially a good one, hurt filter feeders, JMHO