What kind of plant matter do crawfish eat?

Answers:
Crawfish will eat practically anything. Seriously. They are detritous eaters, meaning any plant or organic matter they come across, they will eat it, whether it's dead or they have to catch it. They are very oppourtnistic feeders.
You don't have to feed them fish, but they will enjoy a feeder goldfish every six months if you want to spoil them, the chase of the fish will only give them a bit of exercise, which will by no means harm them. Give the crayfish some veggie scraps (uncooked), too (Anything from pea pods to ends of a cucumber to carrot peels; or even things like orange and peach slices), and a bit of very lean red meat or calimari (squid, which we find works better) once a month. (Don't use chicken or pork, this'll kill them.) Just the veggie scraps once a week; and the meat or squid once a month. One thing, though, only leave the food in the tank for two hours, otherwise it can pollute the tank water. If the crayfish eats it all before the two hours, give them more; but only leave that in for two hours, don't leave any food in the tank for longer than two hours.
There are also crayfish pellets that you can sometimes find in pet shops, you don't have to use these, but some people find these easy to use, as well.

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they are bottom feeders