Betta tank light
Oh, and a heater for a 2 gallon costs about 11 bucks, but they are junior heaters and will break down and sometimes electrocute your fish. Your best bet is to a get 25 watt heater, (expensive, I know, at 26 dollars), but it's worth it, because they won't break down as easily. The best brand is Vsi-therm.
For me, well, I turn off the light. I'd also get them a bigger tank, I have my 20 in a 50 gallon tank. The heater isn't necessary, because the light should give off some warmth.
just turn it off. fish needs sleep too. hehe
Betta fish need a certain amount of light and a certain amount of dark. Just like out in the wild. I suggest leaving the light on during the day and turning it off at night, around dusk turn it off. If they're is still activity around the tank after you turn the light off. Put something over the tank until all the activity goes away, and then take it off.
Hope this Helps!
-Capp
You should turn it off when you go to bed.
Your betta's tank is his whole world. But they are wild animals too, and just like us, they are used to a cycle of night and day, even out there in the paddy fields. Imagine one day you found that it was bright all the time. If you didn't have a clock - which your betta obviously doesn't - you wouldn't know when to do what. Having some darkness helps your betta figure out when it's time to slow down and get some rest. Without some kind of routine, he can get kind of disorientated.
Having a light on all the time will also encourage the growth of algae. You should only have a light on over your tank for 10 hours a day, maximum, in order to prevent algae growth.