I recently bought a new tank heater for my betta. I just followed the directions on the box. It's cold where I live and he was always getting bloated so I thought it would help him be more comfortable. However, he's been getting really sluggish. At first I thought the warm water was just cozier or something. BUT He's spending a lot of time sleeping at the bottom, coming only up for a breath before drifting back down to the bottom. He's kind of pale too and his eyes are much darker than usual. I don't know what's going on, he's really scaring me. Maybe something is leaking from the heater? It is new, and I am so stupid that I didn't think to soak it before using it in his tank first....but I don't know!! Is that a thing? Does that happen? Oh God, he's getting pale I don't know what to do
I changed maybe 1/4 of his water just now....please help!
He has a 2 gallon tank and the heater is supposed to keep the temp at 78+or- 2 degrees. I feed him the betta food made from brine shrimp no flakes or anything dumb like that. His bowl is near a window....