Hello everyone. I was hoping to get expert advice here for my problem. I recently upgraded from 15g to 75g based on my lfs advice. I only filled the 75g with 35g worth of water because I almost out of Instant Ocean. When I returned to the lfs to buy more, they are out of stock. . I now only have only 10g worth of instant ocean left for water changes, and the lfs says they dont know when they will order a new shipment of Instant Ocean. They recommended that I purchase Rock Salt, which is from the sea and sold at the public market. Should I follow this advice and use rock salt with instant ocean? Thank you for any input! Please pardon my poor English.