So this thread was just for conversational purposes; but it was not without inspiration. I am doing some planning for the summer (upgrading) and trying to get things underway sooner rather than later. I have been putting off filling my large "tank" because I dont have the pump/filter/sump all figured out yet; but it occured to me that even though I am dramatically increasing the volume of water I am not increasing the bioload any, and therefore not increasing my filter needs either. I cannot physically install my current sytem on the new '"tank" so I hit a dead end there, but theoretically it would work.