INTRODUCTION OF FRESHWATER LIVEBEARERS TO SALTWATER ENVIRONMENT

Just FYI, although they will definetlely survive a slow acclimations to SW, they definitely will not live healthily nor will they live out there entire lifespan. I would highly discourage going through with this if you plan to keep them long term and even if there just intended as feeders, they lack certian nutritional values that marine preds need to live healthily.

Can't speak for guppies, but mollies are well-designed for living in FW, BW or SW. Their gills and kidneys easily make the switch between conditions, and they can be found in all sorts of conditions of salinity in the wild.

In my own experience, mollies have been easy to acclimate to SW and thrive. A few years ago, I wanted to experiment on finding something small that would graze on hair algae, so I acclimated a group of mollies from FW to SW. Put them into a 2.5 gallon hospital tank and shifted from 1.000 to 1.024 over the course of a few weeks. At the end, I had never seen mollies so shiny black and healthy. Observed them for about a month in a 10 gallon nano, then set them loose on the reef.

Unfortunately, the female clown decided the mollies should live up at the top corners, so the hair algae experiment never got underway. They lived happily in the sump for a few months, then someone adopted them. May still be happily living in SW, I lost track.

funny...I've had mollies die like flies in my FW BW tanks, but since the 1.5 year ago I had them in marine, they are fine, produce like mad and dont die, they are full adult size and eat merrily....I dont agree that they cannot live out entire lifespans