Nope, they are freshwater. They are aggressive so I would not keep fish in with them, personally I think they should be in a species only tank. They molt and are very vulnerable when molting. Im having problems with mine molting as Im kind of new to keeping them myself. There is not much info on the net about them. They need to eat lots of veggies. I had lobster pellets, I found some at big al's. They eat any food that sinks.
No neccessarily a "cray-tank" but he runs the block so its HIS tank. Tankmates are a couple CA cichlids that have grown up with him. He is an active little critter when the lights are dim, but usually hides with full lights on. Sorry for the poor quaity, And I was teasing him haha.
[YT]H_rK9wgL9J8[/YT]
He's a monster in his own regards.