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https://www.etsy.com/shop/HermitGrub https://a.co/d/04VDzwCi Make sure you measure your tank https://a.co/d/0e9uQzL4 This is the sand I personally use but if you find something better suggest going for that. https://www.etsy.com/listing/4363757934/deluxe-hermit-crab-habitat-starter-kit https://www.etsy.com/listing/4493881564/flexible-jungle-vine-for-reptiles https://www.etsy.com/listing/1686607033/sphagnum-moss-natural-bedding-and https://www.amazon.com/dp/B0CT8HGW9P?ref_=cm_sw_r_cso_cp_apan_dp_X4TW3HPGJ2G6XKYWDHWG As in pools just use something in your house like a food container that's big enough for fully submerged and matches the size of your hermit crab. I would add rocks so they could climb out of them easily. If you can't get a 20 gallon tank then 10 will be fine for now. Just keep in mind you need one in the future. Make sure you have a glass lid also. Hopefully this helps. Any more if you need let me know.

Could you send a photo of the rocks? I wouldn’t reccomend cohabing due to competetion and needs. The Pineapples also need higher ventilation and less humidity than the others and are quite fancy/delicate and are more the climbing type than the Cubarises so they have different needs. You can buy ahumidity monitor I have the one linked and it works great. My colonies tend to like a natural day/night cycle. They spend most of their time under hides or hanging in the dirt so they don’t really need lights, in fact some may prefer the dark. Good Luck!