Mollies frequently get ich if they dont have good water conditions. At least in a freshwater aquarium they do. I've got 2 black and one dalmation in a 10 gallon freshwater and i've only had one outbreak on one of the fish. Treated with aquarasol for a week and it cleared up. I don't know if putting them in saltwater would do more to cause it or prevent it. I think it would help prevent it because even in a freshwater aquarium it's recommended that you use some FRESHWATER salt because the mollies like it and it helps them fend off paraistes. With that said, why would you want to spend so much money on a saltwater tank and then put $2 black mollies in it? <img src="graemlins//confused.gif" border="0" alt="[confused]" />
anywho, to each his own, HTH