Quick question my fish has a clamp fin and or fin melt problem just occured last Wednesday, 5th. Today, the 10th fins are worse. I have him in a 3 gallon tank, filtered, heater at 82 degrees. Did 100% change on thursday, used AS as well. How often should I change a 3 gallon tank that is filtered to rid of the fin melt and/or clamp fin? Should I use some maracyn plus?... I recently rescued my betta "Floyd" from Walmart and at first he just had some fin rot but was recovering.... Otherwise, he is healthy, eats well.