Golden snail? How big is it? Which species are you talking about? Pomacea diffusa? Pomacea canaliculata? All snails under the family, Ampullaridae are sexual. Females have the ability to store sperm after a copulation with a male. Do you know the gender of your snail? If it is a female and has been kept with several other sexually matured snails, then it will lay clutches of eggs for months. The fertility diminishes as the clutches are laid on a later date. Be sure to give space above the waterline by about 2-3 inches and keep your tank closed or else you'll find the snail fall tothe floor and damage its shell which may even kill it.
The only fish I keep with all my snails are plecos, nothing else. I'm planning to get male guppies only to destroy the mosquito larva which has invaded one of my tanks. Apple snails will readily eat fish foods, veggies, calcium pills and plaster of Paris pucks. What is the pH of your tank? Make sure the pH is 8.0 and above to ensure healthy shell growth. Lower pH tends to erode the shells badly that they may be beyond repair. I simply drop Tums in my tank and the snails race for the pills. Get the flavored ones as the unflavored ones are ignored. Strawberry flavor seems to attract them best as they like anything sugary.
If you are interested, I also prepare snail jello for them. Search for one of my threads about it. Calcium pills are added there for them to ingest so the shells are kept healthy and glossy.