There are certain brackish water fish that are usually kept in fw that can be converted to sw. I've done so with various mollies, including balloon mollies. Livebearers, in general, are possible candidates for this type of transition, but it is probably very hard on the fish since their bodies must adapt (big adjustment) from holding onto salt ions in fw to pumping out salt ions in saltwater. That is one of the reasons why doing a fast transition from fw to sw will usually kill the fish.
I did it originally to use mollies for cycling my sw tanks, since I had mollies already (first in fw, then brackish, and eventually full strength sw).
Time to go to bed now.
Anthony
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