Betta fish and crawfish?

So today I was at my LSF and I was walking around the tanks and I came across the feeder section with all the poor goldfish and guppies destined to be eaten by bigger fish... Anyways, I was surprised to see little brown crawfish at the bottom of the tank and automatically fell in love. As i type my 5 gallon betta tank is cycling (yes, i know what im doing and it DOES have lighting, heating, and filtration, ect...). So my question is can I have one crawfish and a betta (male) in the tank together? The only reason Im worried is the crawfish will rip apart the bettas tail but since he is a bottom dweller and the betta is more upper/midsection i didnt think there would be a big problem. Thanks!!!