Hi guys, new to the site. I was directed here as one of my bettas appears to have a similar condition as to what others have witnessed.
I'm just going to cut and paste my post from my home forum. Oh, I'm in Australia by the way.
My male Blue HM developed what I thought Fin Rot about two weeks ago. Apart from the shredded fin, he is active and appears healthy.
I water change his tank 20% twice a week, usually during the middle of the day (I work nights) between feedings (morning 3 live black worms, afternoon 2 Hikari betta pellets).
Since the fin rot started, I have been doing a 20% to 40% water change every day, and for the last 5 days I have treating with an anti biotic.
I think it may have started as a small tear in the dorsal fin, that turned grey/white and slowly lengthened, spread and is shredding the dorsal fin.
I have tried photo the damage for people opinion and help. The water is currently yellow from the medication, so he appears as steel blue, but he's a Royal Blue HM.