A bit of backstory:
About 3-4 days ago, my younger cousins won a hermit crab at our county fair. My aunt was less than thrilled but nonetheless they brought him home and have since named him Patrick(which he has been renamed Astartes). 2 days ago, my aunt asked me if I could take him off their hands since I had a hermit crab when I was 12 and let’s just say, I was way in over my head then. I agreed to take the hermit crab as long as my aunt helped me pay for the equipment. The day I received Astartes, I wasted no time and immediately went shopping, taking him with me since I didn’t want to leave him at home without a proper tank. In the process, I adopted a second hermit crab to pair him with. Her name is Marion. I have a 10 gal tank with 6 inches of a mix of ‘eco earth’ and sand. There are two huts, two water bowls for salt and fresh water and a food bowl, along with other decor they can climb on and hide in. I also have two heating pads and the humidity is currently 85 while the temp is 80F, more shells are currently on the way.
I have since introduced the hermits and they seem to be doing relatively well, at least I think. They haven’t interacted much though when they did, they seemed to just crawl all over each other, which I’ve learned is normal socializing behavior. However I’m confused on what could be considered aggressive behavior and when I should separate them. The first night, I didn’t get much sleep since I worried over every move they made.
Last night Astartes also had dug a hole for himself in one of the huts and hadn’t moved since tonight. I was just wondering if that would be something I should concerned about. He has since moved and climbed up inside the hut so he’s hanging. Marion shortly joined him. I’m assuming this is okay?
My final questions are: how many shells would you recommend having in the tank? Any certain styles? Or things I should stay away from?
And I’m moving in for college next week, how do you suggest I move them? I’ve read putting them in a storage tote but I’m unsure of what that means.
I’m very new to this and any advice and answers would be appreciated. Thank you

(Astartes{left} and Marion{right} hanging from inside the hut)
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