12-24-2006, 11:09 PM
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You'll want to check the filter where the pump is located underneath, make sure it's a tight seal. There should be an O ring in there... and when it's snug, no water should leak out. When starting the filter, fill it up with water first. With new filters I always do this over the sink first, to make sure all of the connections are tight... then, if no leaks, I will install it on the tank, refill the back of the filter, and then plug it in.
If this doesn't work, post more details and maybe a pic or 2, and we'll do what we can to help you.