New to Your Home · Aquatic
Crabs & Crayfish
Fiddlers, Panthers, and Escape Artists
Most crab and crayfish trouble starts with a setup that doesn't match how the animal lives. 10 lessons on why fiddler crabs need a brackish beach instead of a deep tank, the land-loving vampire crab and the water-loving panther crab, the small Mexican dwarf crayfish, the plant-shredding electric blue crayfish, molting and why you leave the old shell in, the iodine question, escape-proofing a lid, why large crayfish and fish don't mix, caves for the soft-shell window, and a balanced diet.
About this course
Crabs and crayfish are often sold as tank cleaners for a fish aquarium, and that one idea causes most of the trouble. This course starts by sorting out where each animal lives. Fiddler crabs come from muddy coastal flats and need brackish water around 1.005 to 1.008 with a sand slope they can walk out on, not a deep freshwater tank. Vampire crabs live mostly on land and need an 80 percent land terrarium with a small pool and humidity above 80 percent, while panther crabs live mostly underwater in warm, hard water with a ledge to climb onto. Then you'll meet two crayfish at opposite ends: the small Mexican dwarf crayfish that can share a community tank, and the electric blue crayfish that shreds plants and hunts sleeping fish. The middle of the course covers molting: why you leave the old shell in the tank, what the iodine debate gets wrong, and how to build dark caves for the soft-shell window. You'll also escape-proof your lid, learn why large crayfish and fish don't mix, and build a balanced diet. Crayfish laws vary by state, and none of these animals should ever be released.
What you'll learn
- Why fiddler crabs need brackish water and a sandy beach, not a deep tank
- Land-heavy vampire crab terrariums versus warm, hard-water panther crab aquariums
- Mexican dwarf crayfish in community tanks, and electric blue crayfish kept on their own
- Leaving shed shells in place, and what the iodine debate gets wrong
- Escape-proofing lids, and why large crayfish hunt sleeping fish at night
- Dark caves for the soft post-molt window, and a balanced omnivore diet
Who this is for
Anyone who brought home a fiddler or vampire crab sold as an aquarium pet, keepers wondering whether a crayfish can live with their fish, and owners who just found what looks like a dead crayfish lying on the sand.
Course outline (10 modules)
Quiz & Certificate
Knowledge quiz
After completing all lessons, take a short quiz to test your understanding.
Go to quiz →Completion certificate
Pass the quiz and earn a shareable certificate of completion.
View certificate →Frequently asked questions
Ready to get started?
$9.99 · Lifetime access · 10 lessons