u/Neither_Wrongdoer285

A few days ago i noticed what appeared to be ich forming on my goldfish( have had for a little over 2 years now, unfortunately i have yet to do treatment because i didn’t quite have a quarantine tank completely ready but today I noticed this on this back fin.( I will be starting his treatment tomorrow for the ich)I’m not sure what it could be as I don’t use live plants, the food he gets is some frozen veggies once a week, pellets and/or flakes for other days but what isn’t eaten gets removed the next morning. His normal tank water quality wasn’t anything to worry about when checked a few days ago so I’m extremely confused