Streams been great for (more) years
Not sure when I updated last, but our 2 nano streams for our reef test pond seem to have been going great for close to 8 or 10 years, whenever they were introduced.
They get sealed-in by coralline, but the design has places for water to still get through.
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Inventor of the easy-to-DIY upflow scrubber, and also the waterfall scrubber that everyone loves to build:
http://www.reefcentral.com/forums/showthread.php?t=1424843
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