#supplements

I received this as a gift from BRS (Black Friday promotion). Never opened. I use other dosing/supplementation. Retail is $62. You can have it for $40. No shipping as this box is heavy. :) Pick southwest Ohio (between Cincinnati and Dayton). .

I still have bottles of calcium, magnesium, alkalinity and such from when I left the hobby 7 years ago. The bottles say expired in 2015... is it safe to use? What does expired really mean? That it is less effective or will nuke my tank? Thoughts?