I was cleaning out the pump of my goldfish tank because it's been making funny noises lately (grinding and whirring) only to find upwards of 30 snail egg spots. I rinsed out the pump and some snails came out. I've only seen 1 snail in the actually tank but I removed it and wiped the glass. is there any worry? can they get into or over the filters and into my tank if I don't wash them out well enough?