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Since they filter feed you can likely just let them grab some every time you feed your corals or put some coral food on them. They will also scavenge though so you could probably treat it with a small piece of food every week or two. Crabs are pretty good about finding food and so if you feed your corals regularly and leave a small amount of food in the tank on occasion I don't think you will have any issues.How Often Should I Need And How Much Should I Feed My Blue Porcelain Crabs