Looks like a common to me.
As for hermits and snails some suggest as many as 1/gallon. I would suggest getting several more hermits and sanils. Look for a mix of red and blue hermits. In addition to turbo snails check out margarite and nasarius snails.
I have more than I can keep track of in my setup. I started out with small hermits at $.99-2.99 each as well as snails. I usually pay $1.99-2.99 for snails. I usually wait for a sale and then replensih.