Originally Posted by baylee767
Trust me he'll be fine.
I have so many watts that even though my lights are flourescent, the water fluctuates like 2-4 degrees >.> And my Betta is just fine with it.
Your lights shouldn't be causing that much fluctuation. Do you have a heater that you can adjust? If so, it should turn itself off as the lights heat the water, so that your temp remains roughly the same.
Also, since bettas like lower light, how is it working with your current lighting? Do you give him lots of places to get out of the light, like caves, rock shelves, plants with wide leaves? If not, you might discover he is happier - more active and interactive with you - with less light, places to hide, and steady temp.