My sisters betta started turning yellow in spots on its head and body recently, its been like this for a good few weeks and she's had the fish for months. No change in behaviour or appetite but it just looks a bit scruffy in the fins and has these yellow patches. It was a rescued fish and my sister keeps him in a 2g bowl, she does a 100% water change every week and smaller water changes every day. He's fed live foods and premium pellets. Water quality is good, no ammonia nitrite or nitrate. Have tried primafix and melafix. Any ID on the condition would be great.
Thanks.
Thanks.