I have had my Bristlenose for over a year and he has these white plaque like patches which appear to be faking off around the edges on both sides of his face. They have come up in the last 24 hours. I have been away so no waterchange for 3 weeks I know this is really bad however did a 20%change yesterday and wonder if this could have caused it? He does change colour to patchy bits of white every now and again but these seem more like infected plaques. I have added pimafix and melafix to water. Can anyone offer suggestions? Many thanks.