Greg, I thought that at first. But I think it's something just floating in there, to show the water movement lower in the tank.
I'm guessing the two BIG bulkheads are piped to some sort of device underneath the tank. I just don't know what that device IS. And it also looks like the guy is manually turning something.
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~Drew
10G Nano * 10G Sump * Deltec MCE 600 Skimmer * JBL Viper 150w MH * Zeovit * Vortech MP40W
Millions long for immortality who do not know what to do with themselves on a rainy Sunday afternoon. ~S. Ertz
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