DIY Underwater Crab Dry Zone

Provide your fiddler crabs with a breath of fresh air on the bottom of your aquarium! Fill a large glass jar halfway with sand, stones or aquarium gravel for weight and a sandbar, place the bottle on its side in your aquarium and prop the back of the jar up with a rock. Attach an air stone to the end of an airline hose, place the air stone inside the back of the jar and attach the hose to an air pump.