First off, Mollies need slightly brackish water. So keep that in mind before you get them.The Guppies will be fine in the slightly brackish water, so that's not an issue. There could be some aggression, but just make sure you have the right ratio of females to males for the Mollies, and you should be okay. What size tank?
First off, Mollies need slightly brackish water. So keep that in mind before you get them.The Guppies will be fine in the slightly brackish water, so that's not an issue. There could be some aggression, but just make sure you have the right ratio of females to males for the Mollies, and you should be okay. What size tank?