I only run Reef Crystals by Instant Ocean salt, NOTHING ELSE, never had problems yet! they are well known for great reef salt
Edit: Also I never use my 5 gallon buckets for water changes,always use my in house 32 gallon brute to mix my new salt in . 5 gallon buckets are used for old tank water and disposed of. My son uses 1 marked car wash only , just to be on the safe side. From reading on past experiences of horror stories / tank crashes , most happen because we make little mistakes and get hand soap, dish soap , perfumes or other contaminants into our system by accident. I always 1. think and rethink before i mix and add new water to my tank, i always use the same towel for wipe water off my hands. only wash my towel and return sock in small amount of bleach only with extra rinse cycle. 2. always quarantine and dip fish and corals.