after my confidence with the ehiem now, I felt I could do anything. picked me up a super cheap marine land canister for polishing my gold fish tank. directions to a T and I cant get it to push water out. I purge and purge. I did it with no water in filter, then filled it half way, tried sucking the intake and output to get it going, I can get the intake full of water and then it pumps water maybe less thana quarter way up output. I then cut the hose even more to give hardly any slack. anyone have any tips for me