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So here's my first question... Is that brown "stuff" fish poo-poo that should be dumped, or is it wonderful beneficial bacteria that I should not throw out?
It's called 'mulm'. It's a combo of things including fish waste, so yes, toss it out.

Is that ok? Should the spray be in the middle, or spray toward the front, or does it matter?
It'll work fine as you have it, but I'd be inclinded to put the HOB in the middle and the intake and spray bar at each end.
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