I've got a 150G FW
cichlid tank with two AC110 (500) HOB
filters. My problem is that the foam insert, and it's mounting mechanism (the grayish plastic, u-shaped apparatus) keeps rising to the top and out of place. Anyone have any ideas how to stop this, or is this just normal behavior. I've thought about putting some weight on it, but then I thought I may be defeating some purpose I'm not aware of. Any thoughts?