I cut a few pieces off the end of that return (last picture) and raised the end of the return to only sit in the water 1/2 inch deep. That should help prevent too much back flow overflowing the sump if the check valve fails.
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It was definitely fun putting it together, and getting it up and running! If the Chaeto can help slow down my water changes, I will like it even more!How do you like sump life versus the other filters?