Quite awhile back I remember people talking about this. I heard another theory, that the skimmers, because of different bubble fractioning... will skim out different parts of the dissolved organic load that the other one doesnt get. Bubble-size differences and 'hang-time' will vary I presume. It makes sense. And yes as people mentioned... cant overskim a tank.
Cheers,
Chris
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No more tanks  - Laying off the ReefCrack for awhile!
Cheers,
Chris
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