So, with my bamboo gone, I needed a new way to baffle V's filter. It's an Aqueon Quiet Flow 10 in his 10g, where he resides on his own. What I did was attach a sponge below the filter output. It works really well and then it hit me...too well. He has total roam of his tank because the water is basically still. I know he's a labyrinth fish but he's taken to burynig himself inside and underneath the subwassertang. I know he's come up for air if he needs to but I don't want him to have to. So, doesn't gas exchange occur inside the HOB filter box as well? Air coming through the little vents on top and gas is exchanged as the water moves through the filter. That water is then dumped into the tank after traveling through the sponge on the output, right? So my question...will that be sufficient oxygenation for V to not have to come to the surface to breathe unless he wants to? I'm going to just buy or make him a sponge filter, I think, now that the medication destroyed his cycle anyway, so I guess I'll switch it up in about a week but, until then, you guys think whatever occurs inside the filter is sufficient? He's also getting 30-50% WCs every other day. It keeps his levels totally negative and his water clean for healing, so I guess he's getting fresh, oxygenated water that way too. I pushed the sponge aside so only half of the output is baffled but it's still not much surface disruption for that big old tank of his. Think it'll do though for a week? If I un-baffle it, he gets knocked around hard in that area of the tank and I don't have much betta-safe decor that will baffle as well as the bamboo did. I could also add a tiny air stone I have but the only pump I have is a hydroponics pump. It's great for a bigger tank but a bit strong for a 10g. Moves a lot of air through a tiny, little airstone haha.