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74 F is a bit low for the animals, but calcium carbonate precipitates more easily as the temperature rises. I'd raise the temperature to 80 F or so over a period of a couple of weeks, but that won't help the precipitation problem.
7 dKH is very low for Reef Crystals, but people do have problems with bad batches or the dry salt settling badly during shipment. I had good luck with Instant Ocean and Salifert kits.
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Jonathan Bertoni
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