I have inherited some Seiryu stone with a tank that I recently purchased. It has blobs of glue on it which I can get off relatively easily but it also has a lot of green staining from algae. Will soaking the rock in bleach solution be the right way to clean it or is there some other way that I should use that is safer? I don’t want to rock to absorb the bleach solution and then leach it back into the aquarium when I use it.