Well, I just got home from work and already I see that Tango is better. He's swimming around like a maniac showing off, has built a bubble nest, and seems to be enjoying the air bubble that got caught under his IAL. I don't think I'm going to need to treat him with AQ salt right now after all.
He's opening and closing his mouth really wide, flaring at me and not doing any of the behavior he was yesterday. He really seems to like the new layout of the tank, so I'm happy if he's happy.
Also, he's eating like a pig again. Just offered him two soaked pellets, and he gobbled them down like he usually does.
In the 10 minutes I've been watching him so far (he's on my computer desk) he hasn't done any of the behavior from yesterday and is breathing normally.
*shrug* I'll keep an eye on him, but it seems like whatever was going on with him is not an issue right now?