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I have a free Fauna Marin ICP with a purchase of their salt, it contains 2 tubes, I was assuming 1 for salt water 1 for rodi, but no mention of rodi in the instructions and the pictures of how to collect the samples show two tubes being taken from the aquarium? Anyone know if I need to send in 2 salt water samples for the free test or 1 of both salt and rodi?

