Hi, I was watching my fish this morning to see if any had problems, like I do every morning, and my red Guppy has a weird patch of scales on him that's look slightly raised and whitish, duller in color that the rest. He is acting normally, and my other fish are fine, but I am worried. It doesn't look like Ich, what could it be? Help! I am new to fishkeeping and am worried about my poor fishy.