A quick update, I bought 2 pairs of mollies from the LFS yesterday and tried acclimating them to saltwater over six hours, things didn't work out too well though. One was dead this morning, and two of them were hovering near the surface and didn't look happy so I've moved them over to a freshwater tank. One looked happy enough that I left it in there, so we'll see how she does. During the brief time they were in there I saw them picking at some of the algae that's been growing on my sand and dead grass blades so I think they're a good addition if you can find ones that came from higher salinity originally.