I'm a first time octopus owner, I caught Ursula, the hawaiian day octopus (O. cyanea) 5 days ago. Since getting her into the tank she has refused to eat. I put a range of different sizes of live crabs into the tank which she seemed wholly uninterested in and also tried to feed her frozen shrimp and fish. She would take the frozen food from me, consider it then throw it away. Chemically the tank should be allright. Before i caught her it had been up and running for about 2 months with bio filtration for about a month, it has mechanical filtration along with an oversized protein skimmer. She was alone in the tank which is 120 gallons. This morning i went down to find her on her side and totally unable to move any of her tentacles. She was also unable to change the color of her tentacles. I came back in a couple of hours to find her dead. I have no idea what happened to her. Last night she looked fine. Does anyone know what the problem here could have been? Thanks.