I got some blue/green chromis, and they keep dying. It happens pretty quickly, but maybe 10 minutes before they die, it almost looks like they're drunk - they'll swim upside down, and sideways, and it looks like they're trying to right themselves, but then drift around upside down or on their side for a minute, then try to swim around again for a minute. Then pretty quickly they're just laying on their side on the bottom of the tank not moving. It's kind of spread out when it happens - the first ones died the day after I added them to the tank, then a few days go by and another couple die. I tested the water, and the only thing that seems a little high was ammonia, at ~.4, so I did like a 90% water change two days ago. This morning tested the water again, and 0 ammonia. But then by the time i was leaving for work another one was swimming like that. Any ideas what it could be or how to treat it? All of this is going on in the QT tank. Before I put them in there I treated them with safety stop, and subsequently prazi-pro.