He was the most active, responsive goldie. 3 weeks ago, he started becoming lethargic and occasionally sitting at the bottom of the tank right after every meal. I suspected he was bloated and reduced the food from twice to once a day. But the problem persisted. Daily water changes were also a way to help him out. He got slightly better after a week, only to get worse few days later. And it was downhill from there. Eventually, he sat at the bottom of the tank for 2 days, and that morning I found him resting in the middle of the plants lifeless. Stil not sure what happened to him. Except for the listless, he was a vigorous eater every time I put in some food.