Last night, I got a new betta and a heater for his tank. I also got a thermometer for his tank and one other fish. I took my time acclimating him (it took me from 9 last night to 4 this afternoon), and the way that I acclimate I leave the water level low in the tank and the box said over and over not to use the heater unless it's fully covered with water, so I didn't turn it on. When I raised his water level, I plugged it in and let it do it's thing (it has a preset temp and all that jazz) but the temp in the tank is almost to 80 degrees, so it obviously didn't turn on.
I'm wondering how in the world the tank could just naturally be 80 degrees? It's 78 degrees out in the hallway in front of my room, but I keep my doors shut and my fan on so my room is pretty chilly (I usually have a blanket). It's the same with my other tank that has a thermometer but no heater (dumb boyfriend hid it -.- His sister is bringing it over sometime this week). Are my fish just so amazing that they radiate heat or something? HA!
But the outside temperature shouldn't affect my fish tank... xD My room is FREEZING! At least now I have the peace of mind that even though I'm shivering and my toes are going numb, my fish are comfortable. ;D
2 degrees is not that different. As a nurse, we can have a 2 variant on Blood pressures and thermometer. So, I wouldn't get that jazzed about a 2 degree variant with a store bought heater...preset ones aren't the best so I wouldn't expect it to be rocket science lab accurate. The preset normally run cooler, I have one that won't go above 76degrees.
The heater is probably working, would be my guess, except for the tank w/o heater...
I'm not freaking out or anything, I just thought it was weird... I looked for one that I could set, but they're all like for 100 gallon tanks. I don't think my little betta in his little 2.5 gal would be very happy... The only adjustable heater there was in the store was half the size of my tank! HA
I have a couple preset heaters, also. If you look at the box, it should say something along the lines of "..maintains water temperature at 78+/-2*. So it's totally normal for yours to be running a little warm