Hello! My little brother brought home 2 koi looking gold fish from the fair last night. Right now they are in a little fish bowl, that i use to keep my betta when i do a 100% water transfer. I am going to go out and get them a 20 gal tank, filter air stone etc later today. My question is that both of the fish have some scales missing, the white and orange one has several missing in the shape of a triangle and the orange one is missing a few here and there. According to my brother the guy was grabbing the fiah out of the tank with his hands. They are also just sitting at the bottom of the bowl. I am gonna get some stress coat, but is there anything i can put with them to ward off any infections due to the missing scales?