The wierd thing that got me was, thoes rocks with white on them were purchased from a store here in town. The rest of my rock came from a private party. Thoes rocks are the only ones with white on them. And when they were in her tank which had very little rock in it and a lot of fish, they had no color on them what so ever. They looked like tanish non colonized rock with white spots all over them. I thought they might be worms or snail eggs. It wasnt until a week later when i saw pink alge and that white coating growing on it. Anyway thanks a lot for the info! kudos