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Re: Surface scum

>Date: Thu, 19 Feb 1998 00:34:56 -0800
>From: Dave Mosley <dxm1 at calweb_com>
>hmmmmm.... it's been my (limited) experience that surface scum is
>directly related with surface agitation. if you're running a wet/dry
>filter with an overflow collector you won't have any surface buildup.
>if you're running a canister filter and trying very hard to minimize
>surface disturbance to reduce CO2 depletion then you're going to get a
>solid surface.
>dropping an cheesy airstone in for five minutes will dissolve the
>surface poop. i have yet to find a happy medium - no airstone, no
>spraybar, no drilled tank - aaaggghhhh.

If you are using a canister filter, the Eheim "Surface Extractor" works very 
well for this application.