So, how many mollies would fit, and can pearl mollies and gold dust mollies breed together?

It isn't really a good idea to plan on breeding fish in a community tank. The other fish will eat the babies. Even parents eat their own babies, but the other fish will stress out the mothers and cause more trouble than necessary.

In nature, there is a lot of space for all this to be accomplished. In a closed environment like an aquarium it is just too difficult for babies to survive and all the fish to thrive. The best way to do it with mollies would be to have a 10 gallon tank (or larger is preferred) and have one male to several females.

Have plenty of live plants for the babies to hide in and feed on as they are born. The gestation period for livebearing fish like mollies is 30 to 45 days. It could be sooner though if the females have been with males before you buy them.

Mollies are very nice little fish. There are different color varieties and body shapes available as well. They do require some salt in their water and need algae and/or live plants to eat.

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