I've had my three inch arowana for two weeks . he's ate great since the day I got him ,like really great . fed him three times a day , parts of krill shrimp that I broke off to get past tails and harder stuff and freeze dried bloodworms ..he was in a grow out 40 gallon tank all tests was have been perfect and just did water changes on tanks Friday ... So thats when it all changed .... My 8 yr old daughters last day of school was friday so I took her for ice cream by LFS which I needed to stop in anyways (of course lol) well she suckered me Into getting two small , maybe inch and half pushing two inch jack Dempseys ... This morning when I turned on the lights to feed them they was already having breakfast :-( could I have over fed him and killed him or did they just catch him ? He was always swimming but the little jacks are quick ! Never noticed anything during the day time and I watched him a whole lot .