It's recommended to have 2-3 females per every male, otherwise the females will get too stressed leading to illness and even death. What size is your tank? You should get at least 1-2 more females if it won't make your tank overstocked.
When in doubt, Partial Water Change!
75 gallon ~AquaClear 110, Harlequin rasboras, Cherry barbs, Tiger barbs, Otos, Kuhlis, Rainbowshark.
10 gallon ~AquaClear 30, Guppies