Okay. Just got a 135 with the sump, stand, canopy, and gravel for $250 (cheap) off craigslist. I've never really dealt with a sump before, so I have a few questions. It came with an undergravel, which I will likely ditch. I just want to make sure that I have the concept down. The water flows over the overflow (redundant), then drains down into the lower tank, passes through the bioballs and is returned to the main tank through the sump pump. That's the concept, right? I have valves on my pipes, that came like half way open... Should I assume that's the way they should be? Can you pump too many or too few gph with a sump? Then, after the bioballs, there is another tube pipe hooked up, that goes through this canister thing... I'm guessing that is for more filter media??? (pics to come). Anyway, like I said, this is all new to me, and it will take a lot of cleaning before I get this thing up and running, but if anyone (or everyone) would help me walk through this, it'd be appreciated.


























