first of all, you need to understand why the fish like that,
1. ph shock
2. being poisoned
3. lack of vitamin B or H
i dont think the reason is 3 since it just come to your tank for a day.
the other fish go nothing wrong, so 2 can also be neglected.
i think the main reason is the ph shock, 1 hour is not enough, it is just balance the temperature, to balance the water, it may take a whole day.
shall understand further shock may kill the fish, so i will take it out in a empty tank with air pump supplied. Salts and medicine may cause further shock.
_________________ 友朋知所剔,何患少交遊。
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