The issue with water discolouration in these systems, as seen in some older reef systems such as the Great Barrier Reef display in the Smithsonian Museum (it was actually really bad in this system from the pictures I looked at) probably stemmed from the fact that this was the only form of filtration used in these systems. I would think that used together with common technologies from today (skimmers, prodigious use of live rock, etc.) this would probably be a non-issue.
And if a little colour was noticed, you could just run some carbon.
Glad to see this idea getting some attention. Seems like a more efficient way to export nutrients than a 'fuge.
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Calvin
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Planning a 29 gallon mixed reef...
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