I woke up this morning to find my fish dead after only 4 days.
This is my first fish. I have a 10 gallon tank, with a filter, heater (although I don't think it's gotten cool enough to turn on yet), some plants, and a small cave.
When I first put him in the tank he was swimming around a lot checking everything out. That night and most of the next day he was very lethargic, mostly sitting on the bottom of the tank and not eating. The next morning he was up and about and ate the 2 pellets I feed him. When I got home that night he was sitting again on the bottom of the tank, but he did start to move around latter and he ate the pellet I feed him. And the next morning he seemed good too and ate.
Last night he was sitting again and didn't eat the pellets I feed him. I checked the ammonia and it measured 0.25 ppm. I decided to do a 10% water change. So I filled up a bucket with 1 gallon of water and tried to estimate the correct amount of conditioner since the instructions only give you the correct amount for 10 gallons of water. The instruction say to add 1 tablespoon to 10 gallons, so I would need to add 0.1 tablespoons to 1 gallon. I added about 2/3 of a 1/2 teaspoon or about 0.1111 tablespoons. The water I added was 80 degrees, a little cooler than the water in the tank which was about 84 degrees. But I was trying to cool the tank down since I was worried it was a little high. After the water change he seemed much more active. But then I noticed he was dead when I woke up in the morning.
It gets hot in my apartment during the day with the a/c on and the tank would probably spike to about 84-85 degrees. At night with the a/c on it would cool down to about 82 and then the next morning it would be about 79-80.
What do you think went wrong? Temp to high during the day? Water change conditioning off? Temperature difference of water change stressed him out? Something else I'm missing?
I want to try again since I really like having the fish even though it didn't last long. Do I replace all of the water before adding a new betta?
Sorry if this was long trying to give as much information as I could.
Thanks for your help.