Hello! I am looking at putting some algae eaters in my 72G aquarium once I cycle with LR. I am going to put in 15 Scarlet Hermits, 10 Turbo Snails, 60 Margarita Snails, and 35 Red Leg Hermits. They all come in a pack for a discounted price. I was wondering are there any special shells that I need for the Hermits or can I buy any old hermit crab shells? Any advice would be appreciated.