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One of my panda corys look like it has ammonia poisoning. It's alive, but is just lying still at the bottom of the tank. Even if it does move, it's usually just rushing up to the surface then back down again. I have another panda cory that looks alright, i.e. actively swimming. I have neon tetras that look fine also.

The affected panda cory looks like it may have been quite sensitive from the time I got it from the LFS, since he was pretty lethargic at the time already. Anyways, I've done a water change 3 days ago (about 3 days after I added the 2 corys), and actually skipped feeding for 2.5days after the water change.

Is there anything I can do at this point to try to alleviate the problem? Should I quarantine the cory? Should I change the water again?

Thanks!

well, is there currently ammonia or nitrite in the water? if so then yeah, do a water change, I doubt it'd hurt to do one anyway.

Maybe an extra airstone or a bubble wand.

Good idea! I have a bubbling clam and a bubble airstone.
SOme kinds of Cordoras spp. go up to get oxygen from the surface---ha they're little smarties.

I would make daily water changes of at least 25% for a week and leave the C. panda where it is, a move can be more stressful to the fish than the initial problem.

Reducing the amount of food will also help as will the addition of a carbon filled box filter.

Ian