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Old 08-13-2007   #2 (permalink)
MCA
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Join Date: Dec 2003
Location: Atlanta
Posts: 611
There are many ways to carve the filtration turkey.

For my money unless site logistics force you to do so...I would not use a any pressurized filters. Let gravity do much of the work. Open filter contains give a great opportunity for gas exchange and replacement of DO used by the bacteria.

Water exiting a gravity feed filter system should have higher DO that when it entered. But with a pressurized tank...no way to add oxygen inside...so DO has to be less when exiting.

Some folks will say...you can make up for it elsewhere. I don't want a fitler I have to compensate for elsewhere. I am running two Nexus each with 410 Answers. Each have an Airtech 120L boiling the K1. Each of the two BDs have an Airtech 80L. Works for our fish......
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