Royal reefs saltwater crabs for sale are a fantastic and affordable way to add aquarium cleaners to your saltwater fish or reef tank. Aquarists many years ago noticed the vital role saltwater crabs play in an ecosystem. Some crabs keep pests and nuisance algae at bay while others constantly filter the water for free floating microscopic material. Check and see what the best saltwater crab for your aquarium will be. Do not forget to check out the clean up crew tab for teams of crabs and snails at great prices.