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What are you trying to read? If you mean things like ammonia, nitrite, and nitrate if it's premixed SW made with RO/DI water you shouldn't get any readings
Tap water will cause an unbelievable algae out break. It is best to start a new tank with RO water right from the start. How are you reading the SG with a refractometer or hydrometer? It is best to mix your water out of the tank so you have more control and mix with a power head overnight to completely dissolve everything.
Just tell her everything is on sale and you have to get it now before someone else scoops it up. That has worked for me in the past but I think she's on to me. Hahahahahaha, on a serious note though a refractometer is the only way to go.