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Thread: 90P Medium Tech
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post #4 of (permalink) Old 11-16-2012, 09:47 PM Thread Starter
Algae Grower
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Join Date: Oct 2012
Location: Canada
Posts: 32
Thanks, but the problem is that only two of the 13 pieces has sunk after 3 weeks of soaking. Both those pieces are on each end of the tank.

How do surface skimmers work? And what happens to them if the water level drops below the intake point on top?

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