Egg Sack?

[philg3]

I cant really think of anything that might make you sorry. Snails lay eggs all the time, usually they get gobbled up by your fish before they hatch. Even then most of them will get eaten before they grow at all. My last tank had a bunch of snails hatch and I only had an algae blenny in there. pretty soon my tank was covered with baby snails. Between them and the brittle stars, feeding made the whole tank look like it was crawling (creepy...).

Bottom line i couldnt see them hurting, they will probably just end up as a free snack for your fish.