Over time I have noticed Uno’s fins starting to crinkle and his gills have darkened and so have the scales around them. I am no expert and wanted your opinion on if it is fin rot. I have noticed a change in his attitude he is more tired than usual and a lot less active. I have him in a 5 gallon tank with a filter and heater around 78-80 degrees. So do what do you think? Also if it is fin rot what will be the best treatment?