Hi not sure if this right place im asking on..my regal tang..2 days ago i noticed a couple white dots..called my lfs he said put in filter medium easy life..the spots samed to disappear Wednesday evening..then yesterday Fri morn she looked worst..def looks like infection..i had melafix so put that in..she did come around didnt expect her to be actually alive when i got back from work..now today it looks bad again.shes eating..swimming but struggling agaisnt powerhead..no other fish affected..i put the fish in just last sunday..i had an emperor aswell havent seen her in couple days..plz help..heres pics & vid