04-05-2008, 02:50 PM
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Mollies are a Brackish Water fish, but most Tank-Bred ones have been born and raised in Freshwater. It wont hurt to add salt, but you would have to make sure the other fish (if any) can have salt in their enviroment.
Now there are two types of salt; Aquarium Salt, and Marine salt. Aquarium salt is for ich medications and reducing stress, not to make water salty. This can also be table salt. However, to have salinity in your tank, you need Marine Salt. This would be what you would use for Saltwater tanks.