Welcome to the finest aquarium orientated establishment on the internet. Between “them” on here they know everything needed to run a well maintained fish tank. I unfortunately don’t.
So I help out by making the tea/coffee, bringing the cakes in on Thursdays and taking the trash out everyday at around 4:30 PM GMT.
Though my main job is to direct newbies towards seriouslyfish.com which is just about the best fish reference website on the internet. It’s run by freshwater biologists, ichologists and actual real fish who are elected to their position by their species in ocean/river/lake wide elections every 2 minutes.
Seriouslyfish.com has nearly all the Molly specific information you need. Just enter your fish or others into its search bar and follow your nose. It’s fintastic. Seriously.
BTW someone will no doubt be along to ask about your water parameters soon. Be prepared.