I have no clue what these are. They showed up about 3 weeks ago and I thought they wer possibly some sort of egg deposits or sponges but 2 things lead me to beleive they're not. First, they've grown in 3 weeks, not a lot but enough to notice. Secondly, and this is a weird one, I've seen the larger one send out a sweeper tentacle about an inch long on more than one occasion at night. Any ideas what these things could be?

