fin loss

Help all advice is appreciated. I have a 40 gallon overflow style tank filtration with a protein skimmer. Temp set to 79*F 3 carbon sponges and a biomedia bag. Water parameters are 8.0 pH 0.25ppm ammonia 0 nitrite 0 nitrate salinity is 32 or 1.024 specific gravity. I’ve had a pair of clowns...

Hello, I am desperate to help my 2 year old betta white the white patches in the attached photos. Here is an explanation of the issue: 1. It all started about a year ago with fin rot. We used Maracyn 2 and it seemed to stop the fin rot for a bit. However, the fin rot always returned, and...