I picked up some small (~1.5-2") acei's a couple weeks ago, and now one of them has about 4 white spots on the left pectoral fin. I noticed this last week, not sure if it was there when I bought them or not. The spots are 1-2mm and a whitish color. I will try to get some pics, but he is still very active. He is also scratching against rocks more than the other acei's. Any ideas?