Today when I got home from work I noticed all seven of my harlequin rasboras had white on the ends of their fins. Is this the beginning of fin rot? Anyone know what causes this and the recommended treatment? They share a 60 gallon planted tank with a male betta and an oto. I have some melafix and some ich-attack. Would treating the tank with salt help? I also have a 10 gallon quarrantine tank currently occupied by a few ramshorn snails and future home of 2 apple snails due to arrive soon. I appeal to all learned fishkeepers for your sage advice. Thanks!