Change the water to distilled water.. or iron free water. Dont feed them anything red including treats. I think thas what they say here. I recently started giving my boy distilled water.. i am waiting to see if it works. If i am wrong on the distilled water part please tell me. I am just limited to my choices here in
PR since i don't have a car and have to shop and get whats convenient. I miss all my bottled water choices in the States.
Also wash every day with a warm cloth and that helps clean it off