there is this weird white tube growing out of my GSP, last night i could have sworn there was a worm coming out of it but it was 3am so i am not really sure. but i bought my live rocks from a guy in fb marketplace and i always wondered what those little tubes were. now i think they are vermited snails... but the guy kept the rocks in really low salinity when he gave them to me and they look all broken and cracked with holes in them. can some one ID that white tube as well as give advice on what to do about the potential snail investation if anything.