Fiddler Crabs
 

If this thread fits better in another location feel free to move it. :)

When I was in Jamaica I spent hours watching all the little crabs at the water's edge. If I am able to acquire my friend's 10 gallon, I would love to turn it into a land/water crab tank. (Yes, I know they're brackish. :) ) For those of you with experience in these little guys what would be the best sized grouping of them to have and what gender ratio to limit fighting?

Bump?

I'd like to use reef sand to create a natural environment for them. For the salt should I use marine or aquarium?

either sand will work in your tank; watch that those crabs don't have a way out. They can fit through very small cracks and are agile climbers

This is very true. They will find a way. I even taped up every crack in one of my tanks and I found one hanging out chillin in my HOB filter:shock: