Hi. Well if the line at the back is connected to the sump pump and the water returns to the tank through this line and it runs down to the bottom of your tank then you have got a problem. The return pump fills this line with water. When the power goes off, the water is going to siphon back through this line into your sump and will continue to do so until the level in your tank is low enough for this line to lose suction. By that time you going to have a big puddle somewhere you don't want it and your fish will not be happy. Most people's return line outlet ends just below the normal water surface to prevent siphoning out their tank. I'd shorten the line a lot so that you don't have this happen. You may also be able to find a check valve to put in the return line, but I don't know of any. One of these days the power will go out.
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