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I cleaned the last digest out of my mailbox, but kept thinking about
George's scum letter. So I dragged it out of the archive (Thanks Cynthia,
or whoever for fixing this month's archive listing).
> However, late last year we set up a 29g rainbowfish grow out tank and plumbed it
> into the 120. It had a very thin layer of black gravel just to hide the bottom
> glass and a couple of Java Ferns attached to rocks for decoration. An Eheim
> 2213 pumped water out of the 29g into the 120g and a siphon tube returned water
> from the 120g to the 29g. The 29g had the benefit of the "good" water in
> the 120g without the distraction of hungry mouths.
> Within a day of setting the 29g tank up, it's surface was thick with
> scum! So from this I can conclude "It's in the water"...
George, could you have just invented a protein skimmer that works in