Not sure what this is! New to salt

[terrell wohlrab]

not to revive an old thread, but i forgot to give everyone an update! i ended up going to the local store and the guy gave me a sample of some red sea stuff, He apologized and said its impossible for him to check all the rocks and that is 99% sure where it came from. And i used it. It went away! havent seen any yet, Unfortunatly i think my zoas died. They have been closed up for about a week now and arnt looking to healthy, I might have ti remove the rock