I got 2 of these shell dweller free off a guy on Facebook and need help identifying them. I have them in a 29 gallon I set up for shell dwellers. Are these Multies ? Or some other species? He said he wasn't sure. I want to know so I can look into adding a few more and so I know how to properly care for them. They didn't come out of their shell the first hour or two but now they're fairly active and doing well. thanks for any help!