I got two new hermit a week ago, and I want to make sure they have everything they need?

I've had hermit in the past and I kept them in the little plastic containers that you get from the boardwalk. Yeah, that didn't turn out so well, so this time I wanted to make sure that they were comfortable. I got an aquarium heater and I've been keeping their tank at a consistant 78F. I got two non-painted water dishes one with salt water (not table salt) and one with fresh water. I declorinated it and I've been feeding them shrimp pellets and meal worms with their normal food. I've provided a small sponge with declorninated water. I got them driftwood to climb on and I have extra shells for them to change into to. They have 3 inches of reptile dirt substrate. Than they have a little hermit crab privacy hut. Do I need to get them anything else? I just want them to live a long time and be happy?