"Thanks for the info, I'm sure it will help later... OK, so I have at least one male mollie from what I checked, but I'm afraid that if I have a female, either another male is in there too, and they will fight, or I'll get fries... And I do plan on buying at least one more tiger barb, along with some zebra scissor fish. Is that too many? Or will I have to feed them all seperate foods?"
If you are keeping any livebearers, it's best to keep 3 or 4 times as many females than males so that the males don't harass the females. However, keeping this many females also increases chances of spawning. Keeping a group entirely made of males OR females is fine, since once they start breeding, it can be difficult to control them. But, if you don't mind raising fry, you can sell them to your fish store usually or you can let nature take it's course and let the other fish in the tank eat the babies. I don't know about the zebra scissor fish. Make sure all these fish you want are compatible tank mates. Look online to check.