Tobman,
I set up a 29g tank with TBS LR, but the tank was added in a loop with an existing 55g SW FOWLR tank and about 35-40 gallons of sump. I had almost no elevated readings at all but I only added about 30# of TBS LR and a few pounds of TBS live sand. YMMV and I would expect a larger spike with more LR or in a newly established tank.
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