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#1
05-28-2009, 05:51 PM
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As a total random interjection here, I truly doubt the veracity of claims that pumps are that damaging on plankton. I'm sure some don't survive the trip, but many do and I bet it's safe to say that most will. Just look at how it happens. Copepod dances a little too close to powerhead input, gets sucked in, gets spit out about 10 ms later, maybe a little dizzy but otherwise totally intact and totally alive. It's not like the pump is a blender where the contents are held in place by gravity and repeatedly beaten into a liquified pulp by the blades.. I bet the copepod just hitches a ride in the gaps between the impeller blades and doesn't even make a full rotation before exiting. I'm sure some are chopped of course, but I honestly doubt that pumps and skimmers really have any large impact on the population numbers of plankton/copepods/etc. in a tank, since they prefer to crawl around substrate anyhow..
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-- Tony My next hobby will be flooding my basement while repeatedly banging my head against a brick wall and tearing up $100 bills. Whee! Last edited by Delphinus; 05-28-2009 at 05:53 PM. 
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#2
05-28-2009, 06:57 PM
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I think another way of looking at it is "who cares?"
We all feed our tanks foods that make the nutritional value of some vestigal traces of "plankton" look like peanuts... Dried out, malnourished peanuts... 
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This and that.
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#3
05-28-2009, 08:42 PM
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In the lab, we regularly centrifuge cells at 4000 - 5000g's, and they survive all right. A wee little pump's got nothing on planktonic life.
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