AnglerTheStrangler
- #1
I've noticed that my Bettas sometime do this thing where it looks like they are yawning/gulping underwater. They do it every once in awhile and I'm curious as to why? Could there not be enough oxygen in my tanks? All my tanks are ten gallons with HOB filters and live plants. I even lowered the water more recently just in case that was the issue. What are the signs of lack of oxygen in a tank?