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Perhaps I am confused, isn't the ULR HANNA in ppb not ppm? So you would have a converted number of 0.058ppm. I think that's fine and wouldn't even try to change anything so long as it floats around there and you get the husbandry under control. But I think at this low of a number GFO will be your only way to take it lower, I have not read much on Lanthanum chloride being used under 1ppm only over it.
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