What is this crab?

[Paul B]

They are very fast as you will never catch one by running after it. But they are not "mean". If they could, they would buy food at McDonalds, but they don't have thumbs to hold their money with so they have to resort to catching and eating fish. They don't even care how much your fish cost as they like them just the same.
Almost all crabs will eat just about anything. Lightfoots normally eat algae, but will eat a tuna fish sandwich if they could. So would I

 

[Calappidae]

The thing is.. crabs are always hungry and when they run out of algae it becomes open-season for them. I had a sally-lightfoot chase my finger around the front of a tank at the LFS.. right there I can already see a problem. I had a sally-lightfoot before and it terrorized a few things. I had a Calappa Calappa in there as well which normally kept the other fish hiding. lost everybody overnight from a condylactus nuke...