I got told that a good way to make bettas not see each other is to put Java moss on the divider. I was wondering if it would work without any light source besides the main room light. I don't have the money to spend on an appropriate cover for my tank and was just going to cut a window screen to fit around the heater and filter until my finances permit me to buy one.
If I do need a light, what wattage would I need for a 10 gallon?
I'm new to both fish and plants so any suggestions would be helpful.