Stop feeding nori!
As much.
Yes I'm serious.
I have stopped feeding my whole sheet of nori every day and have cut back to 1/2 sheet every 4 to 5 days.
This has been a big change for my huge algae eating population, but, they are all still very fat and have been for the 2 months I have been doing this.
Just a thought.
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No matter what the morrow brings, inventors keep inventing things.
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Jonathan
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www.cakerybakery.ca