Have you added any chemicals, or algea killer medication? when i added some to kill my slime algea it overflowed like that for 2 days. Also, a good way to keep it from over flowing on the floor is to take a drill, and drill a hole that is a little smaller than air line tubing into the collection cup, right below where the bubbles overflow. so that the hole is below the hole where the bubbles come out of, this insures that the filthy junk doesnt flow back into the tank. Then just put some airline tubing into the hole, and run the tubing into a jug, or bucket, and no more water on the floor if it ever does overflow!!!
I have the same skimmer adn it overflowed 2 times on me, so i decided to make this modification, works great!! just be careful to drill carefully and not crack the cup.