Should I sterilize my equipment after every use? All my fish seem to be cured but this gramma SMH No matter what I do she continues to scratch. A couple days will go by with no scratching and then she’s back to scratching. I’m wondering if it’s my utensils. I sterilized once when I thought the tank was cured. All I use is a feeding dish, a particular bowl and a turkey baster. Should I sterilize after treatment or every use?