I am new to the octopus keeping hobby and have had a tank raised octo for about a week now. I was worried because I hadn’t seen him since I let him out of the bag. I resisted all urges to rip the tank apart looking for him. This morning I found him for the first time under a tiny ledge in the front of the tank barricaded by a shield of hermit crab shells. Every time I try to come eye level with him he moves the shells around to conceal himself more. Is this normal behavior? Is there anything I can do to make him feel more comfortable in his home? I have two damsels in the tank I thought he would just eat them, but is he scared of them?