When planning out your reef tank, it is best to start with the best crabs. Consider https://www.youtube.com/watch?v=DKq7mIUe-WQ for amazing crabs. In building my Reef Tank I soon learned that the most important component are the crabs. I have spent hours watching my crabs and their interactions in the reef tank. These intriguing creatures are truly fun and educational for children. If you have been disappointed in the past with crabs purchased at the local pet store look to https://www.youtube.com/watch?v=DKq7mIUe-WQ for the crabs you have been dreaming of. These crabs are healthy and full of energy. Keeping an eye on them is so much fun you will loose track of time.