I have my Betta in a 1.5 gallon tank for now. He is Always flaring and chasing his reflection alot. i really don't want him to stress out too much. he is just getting over fin melt. Is there anything that i can do to reduce the reflection that he sees?
I just tried a little experiment that you may want to try at home, just to see for yourself.
Dark backgrounds reflect the most.
White ones reflect less.
Cardboard brown reflect even less.
But the thing that reflects not-at-all is a background that does not touch the tank; even a half-inch of space between them when it's lit up by the tank or the room light. This is related to the following:
Everyone knows that a lighted tank in a dark room has reflective walls. So light up the room/background.