I think you hit the nail on the head about the oxygen. I realized that I had no surface breaks in the any of the system. Everything was submerged. I think my water and the fish are just fine, they just drowned, so to speak. As soon as started rippling the surface of the main tank, the fish started perking up and two hours later he's flying all over the tank, exploring. I think he's going make it.
To top the day off, my skimmer sprung a leak at one of the joints, soaking my carpet in a spot. No worries though, cause cause the clown fish is gonna make it.