I made sure mine was eating and comfortable before I slowly switched it over. Every week when I do wc I would increase the salt till I got to 1.012 and kept it there.oh dear.....I just got mine from a FW set-up on Friday (I think) and they are still only in FW, but they are both like 14"-16"....should I be graduating them to brackish soon or let them acclimate for a few weeks......or months 1st?