I've been thinking about this, and another advantage to the upper resevoir is re-filling: you wouldn't have to unscrew the near-airtight lower container.
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-Ernie
29 Gallon Tank: 110W PC Lights, Milwaukee MA957 CO2, Fluorite/Sand Substrate, Checked into E.I. Rehab
MY RENA FILSTAR XP3 PIMPS ME! (#67)
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