Woke up this morning to the room that my tank sits in full of tiny little flies the kind that fly very slow and can be sucked up with a vacuum. Covering the top of all four walls in the room. I am guessing maybe they were attracted to and laid eggs in my skimmer cup since I have been draining and not cleaning it. Has anyone else dealt with this? I am vacuuming them only I guess until they are gone but crazy how it exploded overnight.