most ppl hate snails, i have them in my baby tank with the ton of guppies, BUT if you like them leave them in, they also spread too that tank you have is small? all you have to do once a week 25 precent water with a gravel cleaner, clean the glass rince out the filter in the water from the tank every few weeks and boom should be no problems
i just do mine when i feel like it now or they look like they need it I learnt my lesson from over feeding
i have bred some nice blonde guppies and some tux ones with amazing tails this lot dont look as nice for some reason lol