Fin rot? I see fine fins. A ten gallon is fine for a small goldie. It seems you know a little about cycling so you'll be able to see to it that the water conditions are good, but they should be fine. I have a goldie tank fully cycled with a box filter, and I still have aquarium people telling me that's impossible and I must do water changes daily. Parameters read 0/0/5 everyday and I barely touch the water.
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