My flow wasn't too good before. I think you're right on it being a contributor to the dinos. I had it slightly lower than I liked because every time I would increase it, my sandbed would start flying up. But I spent a lot of time during the blackout to get better angles with my pumps so hopefully it helpsHow's the flow down there? I have a spot or two that don't get much flow and it seem that this is where I get the same thing sometime. If I change the flow it clears right up, at least in my tank