I have 17 goldfish (formerly feeder fish) outdoors in a 100 gallon galvanized trough. (I plan to acquire a 200 trough soon, and I know that is still too small.) The fish are a couple of years old, and have thus far remained healthy. However last week I found one on its side in the plants. I isolated him and days later he is still alive. His tail is bent and the scales around the bend appear slightly abraded which has led me to think he sustained some sort of injury. He appears healthy otherwise with clear eyes, good color, intact fins, etc. He is eating well. He is currently in an aerated bowl that I partially submerged in the large tank. Should I keep him isolated? If isolation is to continue, he’d need to be moved to a larger tank indoors which would be warmer overall since it wouldn’t cool down greatly at night. Should some type of medication be added to the water? If released back into the large tank while injured, would he be set upon by his curious tankmates? Should I return him to the large tank and his tankmates and hope for the best? Perhaps there are better ideas? Thank you!
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