Hey all! So Tsunami has developed fin rip/rot for the past 3 weeks and i've tried everything to cure it but it won't heal? I've tried aq salt, bettafix, stresscoat, e.m.erythromycin, you name it! His fins show no sign of healing. He is in a 3.7 gallon hospital tank with a filter and i'm buying a heater for it this afternoon. Help!