Second are these brown bubbles on this snail...what are they??
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Looks like Bubble algae on the snail.
1. bubble algae - the green variety of valonia can be dark brown. Whats more worrisome is if its the red valonia - which is a serious pain in the rear to get rid of. Either way, grab that snail out and toothbrush him/her off to get rid of them. A quick rise or three and then pop it back in.
2. snail eggs - nassarius and ceriths (I think) lay eggs like that. a stringy white mass, it can be a tight grouping, or really drawn out like that.
Yes, I agree on both. Definitely bubble algae and snail eggs.
. But I do love baby snails. There are like 4 clumps and that one string!! 

