Well when I put the lower selector in the supply has been working for months.
As for the housing, maybe I have the narrow, I am trying to get more flow across my tank, its 7' long and 3 ' wide. I've been doing some reading on the flow patterns and the narrow housing has a long flow pattern which I need, but I need to try to cover the 3' width. I have a 6205 on the opposite end near the bottom and this 6105 on the top.