I just set up my 50 gallon Seaclear tank with built in skimmer box. I am using a MegaFlow Sump Filter that I purchased from DrsFosterSmith.com. http://www.drsfostersmith.com/Produc...8&N=2004+22778
The filter came with a plastic flexible drain hose, but I ended up using the clear tubing that came with my Seaclear tank to drain from the skimmer box to the filter. The problem is when the water drains from the skimmer box it drains normally for a couple of seconds and then you can see a big air bubble force it's way down the tube and into the filter. When the big air bubble gets down into the filter, it unleashes a surge of water through the filter. The surge of water is similar to what you would see in a jacuzzi. There is a cover on top of the filter that is supposed to prevent evaporation, but the surge of water is so strong that it blows water everywhere and is very loud. It hasn't been a problem so far except for the noise, but I know this isn't the proper way for the filter to drain. I don't know why I have a huge air bubble force it's way down every couple of seconds and I'm concerned that the water will eventually overflow out of the filter. The tank appears to be filled to proper water level, but the tube that drains the water from the skimmer box to the filter isn't completely filled with water. It drains quietly when it isn't completely filled with water, but when the amount of water increases, which happens every couple of seconds, it forces that big air bubble through which causes the surge. I can't figure out if the problem is with the tube, the water level, the skimmer box or some other issue. Can anyone offer any suggestions as to what is wrong and how it can be resolved? If it would only drain consistently, I think the problem would be resolved, but it currently drains with a certain amount of water pressure and then pushes more water down every couple of seconds.