Its good you know what to look for. Hopefully your fish don't have it. Let me know your water parameters and how your fish are looking after the water change. It could just be stress from poor water quality (which is also due to your new tank). It is hard to diagnose things without actually seeing the fish in person. I try my best to help.
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Phishie
Site Coordinator

"An ounce of prevention is worth a pound of cure."