Cam, the value of 1.026 is the average SG of the reefs our corals come from. This value also corresponds to the correct values of Ca (and all other elements, really). Lower salinity means lower everything else (in nature).
I've also tested the water locally and SG is much lower. pH is under 8.0 also, mostly due to FW run off close to land. Can your prawns live in this for a while? Sure. Long term, maybe, but not optimally.
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Brad
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