id please

[fishguyxd]

I have these little things that hide in the LR and send out a small tenticle out about 1 1/2 inch (the end of this tenticle looks like it has a head on it) and it waves in the current and then retracts in. day or night. I also think I have some other type of snail thing (or from snail family) that fires out a webby type strand to other rocks Just wondering if anyone has an idea.(sorry no pics of them)