So, I was doing my water change yesterday and had to disconnect the outlet tube on my SunSun 303 (again!) in order to get it primed. I got the tank filled, the filter primed, and was adjusting the position of the outlet nozzle on my filter when the tube popped off. Hello, water. I had to drop the tube on the floor so I could unplug the power strip before something really bad happened, which I was able to do. I then took everything out of the tank, dried it out with about ten towels and an old hairdryer, and put everything back together again. Now, I periodically hear the SunSun making loud suction noises. Any thoughts on what that might be? It can't be air in the tubes. At least I don't think it can be air in the tubes. Honestly, it was a nightmare water change before all this happened. I can't keep sand clean for anything. I know all the tricks and they don't work. Tearing the tank down is a very viable option after the last 24 hours.