Hello, I'm new to the forum and have a quick question... we got a betta about two months ago. He is in a 2 gallon tank. He seemed happy there, was very active and eating.
We decided to get a heater to help keep the water at 75 (it was around 68). This past Sunday, we changed his water (using spring water) and he seemed very stressed. Then we got a heater, and gently upped it 1 degree a day. Today it's at 73 degrees.
He discovered the heater, and now he floats next to it and doesn't move. Ever. He floats at the top of the tank and now has clamped fins... he is eating but is very lethargic.
I was going to try changing the water 100% tonight as it is a bit cloudy. Is there anything else we can do? I'm really worried. I thought the heater would be a good thing!