I don't know about not worrying about them.. They are pretty harmless towards other fish, but they can become a nuisance if not taken care of soon, as they reproduce faster than rabbits! You might get an assassin snail to consume them once your cycle is complete. For now, if I were you, I would be taking some slices of blanched cucumber or zucchini and putting them in the tank to catch the freeloaders. It won't get all of the snails, but it will help with the population some while you wait for the tank to finish cycling. Just take the cucumber/zucchini out and remove snails and plop the slice back in the water. You will want to cull the snails so that they don't have to suffer too much. Hope this helps a little.