Everything you want to know will be answered in this video.
Betta fish light at night.
If you notice your betta is acting in an aggressive manner when the light is on then it could be because he is seeing his own reflection.
You should aim to give your betta 8 12 hours of light and 12 16 hours of dark per day.
Some bettas won t eat at all when stressed by too much light.
However just like their wild cousins captive betta fish do need to sleep at night.
If your betta fish has too much light it can become overly stimulated and stressed.
Your betta has a day night cycle it follows just like you.
The easiest way to do that is by turning the tank light on when you get up in the morning and switching it off when you go to bed at night.
So you must turn out the tank lights overnight to replicate the natural day night cycle that the fish enjoy in the wild.