100w heater in a 10g tank?

Hey everyone, I've had this 10 gallon since Christmas and the temp outside was dropping past -30*c and when this happened, the tank thermometer was fluctuating. Even now half way through summer it still fluctuates quite a bit when I have the light on or off. I read a bit through Google, but would like to hear some opinions. I currently have a female Betta in the tank which may be moved to a different tank,as it doesn't get along with guppies. Then I was thinking of putting in 4-5 guppies. Thoughts?

 

Welcome to 3reef.

You are going to have significant swings in temperature if your house temperature swings a lot. A 100w heater will help keep the swings down provided it isn't set so low that is does not activate because your house temperature has risen a lot.

Your stocking plan sound fine.

 

I just put it in yesterday and have been monitoring the temp which is holding steady at 75*F/24*C I may turn it up a tad bit more

 

If your house temperature gets to 80 so will the tank most likely.

 

Welcome to 3reef.

And yes a heater should resolve that issue.

 

It doesn't usually get that hot in the house, but I know what your saying

Thanks, it has solved the issue so far ;D

EDIT: Adding this heater has made a huge difference in my Betta's behavior. It no longer tries to eat the apple snails I put in. It is also nice that the temp doesn't dip down when I turn the lights off anymore. Hopefully I can add a few guppies without the Betta going crazy