Infection in stingrays mouth

mr ry

My leo ray that ive had for about 5 or so months has a mouth infection and i was wondering what i can do to help ? here are some pics ....

ill also post a video once i can ..... she is now in a 75 gallon other than prazi pro is there anything i can do to help her... there is none in my town so im ordering it today.... any experiences or know how they get it?