I had a spare AquaClear 50, so I decided to get it going on the 40 gallon tank that I had my haps in, since I'm planning on getting some more fish for it, and I can't get it to sit on the back of the aquarium. I think the aquarium brace is too wide, the filter doesn't sit completley over the brace. Should I try putting something under the filter? I guess I'm just worried about the stability of the filter, because one time I had an AquaClear 70 tilt back too far, and the water started spilling out of the back of the filter onto the floor.