Lowering alk

[Galizio]

I'm filling my new tank with all brand new saltwater, and pretty sure I'll need to lower the alk before transfer everything over. I use the io reef crystal, still in the process of mixing , don't know what the alk is going to be by the time I'm done but I'll like to get my alk at 7, same as the tank I'm running at the moment...
I read about the muriatic acid and just wondering if there is another way or product to get the same result or if the acid is the easier way will like to hear it from someone that already did it or still do.
Thank you


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