Snails-good or bad?

[icepotato89]

hello, i've got heaps of snails in my juvinile murray cod tank and they multiply like crazy (i think they came in on some plants). i've noticed lots of transparent eggs on plants and some on the glass. so far they've kept my tank algae free but since there multiplying at such a high rate will they also eat my plants? hopefully someone can identify what species of snail they are and if and how i can get rid of em.
thanks.