I'm using 3x1x1 tank, 2 partitions into 3 sections.
Inlet in the right section and rainbar from left to right.
I have hof on the left section. The water is flowing from left to right.
I have been ueing this setup for awhile, So far everythin is okie.
U might consider adding hof to aid in water flow n extra filter too.
Hope it helps.