Ok I know that the two don't go together, but I have some live rock that I was killing I guess you could say because of a hair algea infestation. I left it out in the sun with no water for about 6 weeks, and it has turned compleatly white. My dwarf seahorses could use a little bit of aquascaping, and was wondering if it could be safely added to their tank. Would any hydroids have survived the sun bath? If so then I wont do it.