ok i have a algea problem. this is wierd to me. i thought i had diatoms and then thought it was dino now im not sure. this went from being a greyish brown dust like substance that looked like dust bunnies then to a brown slimy looking stuff and now seems to be changing to green hair algea and some of it has some stuff that looks like leaves from a fern or something. i still have the brown stuff on other rocks that is also changing here and there. it is also is starting to grow on the sand. any help?