MT79 and Mbeef61 are certianly right- i had the exact opposite happen to me. i regularly use IO, and went to switch to Tropic Marin. corals and inverts HATED it, i beleive that it was just the change they hated- not nessescarly the salt, since IMO
Tropic Marin is the best salt you can come by.
p.s. if your looking for convenince, order buckets online- wayyy better pricing than LFS
, even with the shipping costs, and its delivered right to your door