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[APD] surface algae

> I would remove the scum from the surface several
> timesa
> week, and
> still it would return.  I tinkered with the nutrient mix, and that
> didn't help either. (all the plants were growing very well during
> this time, BTW)

This also has been my experience.  I've even tried a blackout to get rid of
it, didn't work.  When I manually remove it with a paper towel, it congeals
again in hours!  My next attempt will be making a surface skimming box out
of PMMA, putting the suction side of a powerhead on the bottom of this box
and running it through a hang-on-tank UV.  It has really been blocking a lot
of light!

Jeff Ludwig
Newark, DE

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