how many different types are there? i used to keep australian ones, red and green. cheap. lasted quite a while. but they like killing each other. i also used to have a wood shrimp. doesnt have pincers, uses mantis folding limbs thingy. thinking of getting a mantis shrimp. beautiful, can make u bleed easily.

driftwood doesnt kill crayfish as far as i'm concerned. crayfish are the hardiest types of shrimps available. other shrimps are very sensitive to dirty water.