Posted Nov 13, 2017
If you have a big open air tank with at least six inches of sand, good but not overly powerful flow, and very good and consistent water quality, and are looking for some sand cleaning and turnover that won't be casually snatched up and eaten, the horseshoe crab might be right for you. They get very large, up to a foot long, and spend most of their time under the sand, so they are unlikely to be targeted by predatory fish. They will push over any rocks you try to keep set up, so have a cemented display or no rocks. An ideal environment would include a sandy slope to shallow water and mangroves, but this is understandably difficult to achieve in the home aquarium.