thats pretty much teh issue i am having

You can make an overflow....

http://www.nano-reef.com/forums/show...light=overflow

http://www.csd.net/~cgadd/aqua/overflow.htm

reply
 

Consider that an over flow is very similar to a toilet, with plumbing present to regulate the hight in the bowl. Another trick is to attach an air line to the top of the U tube and to a power head. This will remove any trapped air bubbles so that the siphon is not lost.