A few weeks ago I ran out of shrimp ( I know rookie mistake ) and couldn't get to the store and they both did't get anything to eat for 4 days, but when I had shrimp and tried feeding them they did't eat a thing. The water parameters are all fine and there is no viable sign of illness, they haven't eaten in 3 weeks and it is becoming concerning, both of them seem more lethargic and not as perky as they once were. There are no signs of wasting so parasites seem unlikely, also the I've caught the arrowana resting on the bottom once and a while and the fire eel slowly swimming up to the surface and them coming back down without gasping for air.