Having the amount of snails that I do,I've noticed that baby snails are often found on my bigger snails.I tend to think that it's a fast "Hitch-hike" to the nearest food.

Those Brig babies of mine are so tiny.The other day,I was on my way out the door to work,and I stopped to fish out a snail that had a baby brig on the inside of the Bigger Brig's shell near it's syphon!

I don't even know how I even noticed that with two hours sleep!

I guess if they can crawl in a snail's shell,that they can probably crawl back out when they want too. Hey Tink,what were your water Param's on that tank? Was everything reading okay? I would go that route,before I thought the little snail did it. Just me though.