I just got home from work and my tank is 2 degrees warmer than when i left this morning (9 hours ago) or at least i believe it is... i didn't really LOOK LOOK. but it's usually always set to 80 degrees, i come home, and it's 82.
i have a heater so i don't know whyyy it would do this, the thermometor i have is just one of those "mood ring" type ones where the colour comes up on the number, so maybe it isn't technically accurate, i am planning on getting another thermometor in the next few days/next week when i go back to the LFS to get more plants/decor.
my apartment did feel warm when i got in today BUT my heat is much lower in the house than the betta (celcius wise he is at 27 (80 farenheit) and my apartment is only at 22/23 celcius which is equal to 72/74 farenheit so it can't be the room temp heating it up)
usually it stays at its steady heat without fluctuating......