ghosts can and do survive in fw, in fact they are a fw species, which i have recently discovered myself, the lfs had us believing other wise for the longest tiem(and most of us know how i feel a bout the lfs's, but being shrimp, i had no reason to think otherwise),
however, i do have one question, how come you come here for fw advice?, as i said, LOL,we are all intrigued, and some of us have actually offered suggestions, which are realistic,LOL, we must really like aquariums,ROFL, otherwise you'd have been told off by now, instead we are debating and keep coming back, some of us ahve seemed to get irritated, but you have to excuse us, we love this hobby and some of us do not take kindly to pranks and misleading(not that yours is, it does seem real, but others definitely are not)
ok, isaw where you were thinking of converting, and wish to welcome you aboard and all the luck, teh best thing here for you is to seek out advice on sw and your change, but as for the fw fishes, you can see wahat kind of heat that generated, i would reccommend a book, called "the new marine aquarium" by michael paletta, this will help with many answers, and others can be asked here(just be cautious of the debating team), we will all try to help if you are serious, even(i'm sure) mr tang, he really does seem to be a good guy who would not mislead you, just thought you were pulling his leg(he takes this hobby seriously, as all should)
GOOD LUCK