Most people on this forum are very caring people, and want only the best for their fish, but too often they are killed with love. If a fish has minor fin rot, many treat with extensive care, only to be nice to the fish, but overmedication is one of the leading causes of dropsy and other liver diseases in bettas. Bye all means, help a fish out if he or she is in need or sick, but really a bit of aquarium salt and some clean water is a pretty good cure all (not in all cases, but in many)... Keep medication to the minimum possible, but do use it when needed! Just wanted to mention this as many betta keepers overmedicate and end up with a dead fish...