"I agree with the previous reviewer. I have had this unit for a few years. Until I read that review, I could not figure out why water was coming out of the top rear of the tank. It can be a significant amount of water in a short period of time when you don't see it coming, so it causes water damage on the floor & tank stand and water loss to the tank.
That being said, there are pros as well. It looks neat & clean, and its easy to use. Filter is accessible, biowheel is great, my light also works perfectly and always has. It does a good job of keeping the water clear also. The leakage problem is severe enough, however, that I wouldn't purchase this unit again."