ohh wow i didn't know that! thanks for the info. i'll have to go out and get marine salt. i have all mollies, so they should all be just fine in brackish water. haha well at least salt is inexpensive! i didn't waste any money.
the med i'm using says it's a month long water treatment. should i just put it in the comm. tank as well, and put him back? before i switched to the month-long med, i used some that was supposed to work immediately, and i did notice a change for the better after 2 days of treatment. i really want to put him back in the comm tank- he looks so forlorn!! is it safe to put him back now, along with the month-long med in the water?