A betta does not need the aeration anyway. So I see no need for a stone if you have a HOB running.
no, water can only hold so much O2 anyways...I honestly don't think lack of oxygen is the problem here. Unfortunately I got nothing esle as your params are fine and he's eating.We're back, and amazingly, he's still alive - but just barely. He was hanging out on his favorite leaf when we got back, and swam over to greet us. I thought he'd made a remarkable recovery, but now he's back on the bottom of his tank on his side, still gasping.
I'm going to do a water change just as soon as my husband gets back with some new Prime, but don't know what else to do. Now I'm not so sure that it is a lack of oxygen in the tank, but I asked my husband to pick up an air stone as well. Do you think I should put it in - or can I give him too much oxygen (2.5 gallon tank)? The water level is low enough that the filter has a slight waterfall effect, so I should think the water already has enough oxygen in it, but gah - I'm flying blind here.
Also, I fed him 1 pellet when we got home when he came up for air, but maybe I should hold off on another? He last ate 2 pellets Thurs morning.