shrimp?

hello i am starting research for buying vampire crabs when i start studying, this will be around a year intro the future so satrting to plan ahead, i was wondering if i keep a couple of crabbs ( thinking 3-5( let me knwo if this is a good amount or if i shoudl have less/more) in a 80-100 liters (around 20-15 gallons i bbelieve) but i was wondering if shrimps could be a possible tankmate with em?