Ive had him for around a month and a half and he started out good and nice. He was in a long 30 gallon tank with a filter and a heater. I fed him brine shrimp and blood worms which he loved and ate.
We had some problems with the tank at the start and I did water changes and even a full water change with him in a cup til the tank was ready again since I tried to add some fish from a unreliable store and the fish turned out to be pregnant.
He was the only fish in the tank so I don't think there was a ammonia surge from one fish in a 30 gallon tank. I did the full water change around 3 weeks or so ago so he lived a happy life for another 3 weeks.
He started to lay on the bottom of the tank doing nothing not even when I came to the tank which was weird. His gills seemed to look a bit darker as in pitch black but I think it was like that to begin with. I make sure to check on him every day and hes been like this for a atleast 3 days
I check on him today and hes dead.
RIP Caesar you will be missed.
If anyone knows what I did wrong please tell me.