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Neons coated with substance
I've had two neons die in the past week, and I froze one out of its misery today, because a white-ish, semi-transparent coating that's formed over some parts of their bodies has been killing them. It affects the dorsal fin first, then coats some of the upper half of the fish, and I've noticed the trend takes 2-4 days to kill the fish.
I found two of them dead on separate mornings, and today one was floating upside down with his gills still moving...occasionally he'd right himself, only to drift around and end up on his back again. The danios eventually started pecking at him, so I removed him, put him in a water-filled ziploc bag (double-bagged), and put him in the freezer. I heard this is a rather uneventful, humane way to kill them.
I also noticed a bit of a whitish film covering the sides of my swordtail, although it's not as thick and obvious as it was on the neons...and I can only see it when the fish is facing toward or away from me, not side-on.
Finally, I'm down to 2 neons in my tank. Should I get more to help de-stress the current neons, or should I let all the neons die (assuming it's a neon-specific disease) and then decide on whether to replace them with different fish, more neons, or nothing? If I get more neons, I worry that they'll get the disease too.
So I'm looking for several things:
1. What disease is this?
2. Will it affect other species?
3. Does my aquarium water need some treatment for this illness?
4. Is freezing a humane way of killing dying fish?
5. Should I get more neons or let the disease take its toll and then re-stock?
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