I had a pair of clowns in an old tank, which I broke down. I moved them both into my qt tank for 48 hours while I set up the new one. All throughout the time in qt, the mocha has been fine, but the black ice immediately sat on the bottom with very rapid breathing. I moved them both to the DT yesterday and the same thing. She hasn't eaten in 4 days and just lays on the sand. There's no visible sign of disease and the mocha is completely fine. Any ideas? Both the new DT and QT were well oxygenated and filtered with established media, so no ammonia issues. No medication was used in the qt. The spots you see all over them are sand. I stirred some up while working in the tank right before the video.
Here's a video I took
Here's a video I took