I like tropic Marin , I’ve tried many others they’re all good don’t get me wrong , but one thing I noticed was with Red Sea salt , Instant ocean when I would mix salt in a bucket and after I put the salt in the tank and take a white paper towel to wipe to bucket dry I would notice brown residue on the paper towel , but upon switching to tropic Marin no more brown residue , I understand it’s hard to get right now but soon it will be avl everywhere again!, I truly believe that tropic Marin is a cleaner salt, reefing is not a cheap investment so why put salt that will “do the job” but “dirty” in your expensive investment , just doesn’t make sense.