I have a Yellow and a Naso tang in my tank. I feed a piece of nori about 2" x 3" daily. They and the rest of the crew devour it very quickly when I put it in, and continue grazing the rest of the time. Both tangs are quite healthy.
I can't imagine needing to keep a constant source in there for them and how much that would even be. I get that in nature they would have infinite sources available to them 24/7 and would graze regularly, but they would also be expending much greater energy swimming on a reef and would also grow much larger than an in aquarium. You would also have the potential for water quality problems with higher feeding levels. This might be a good practice in a very large tank (500+ gal) with multiple tangs. I can't see it being practical with average sized reef tanks and one or two tangs.
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I retired and got a fixed income but it's broke.
Ed
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50 gallon FOWLR, 10 gallon sump.
130 gallon reef, 20 gallon sump, 10 gallon refugium.
10 gallon quarantine.
60 gallon winter tank for pond fish.
300 gallon pond with waterfall.
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