What the heeeccckkk is this on my tank's glass? I'm not sure if it's some type of algae or something else, but I've tried to wipe it off and it doesn't seem come off much. I hope it's not something harmful to my fish and shrimp. If anyone has any clue, let me know. I'm moving out of state soon and want to get to the bottom of this. ompousmpous: thanks!