tentacle

Tyree Mummy Eye Chalice Ive had this guy for one week, and I’m letting him hang out on the sand and get used to my lighting before placement. Ive seen his tentacles come out at night, traditional clear, hard to see things. However today this is what I saw in the middle of the day. Three...

Stationary tentacle or worm, nocturnal, rapidly shrinks in bright light to what basically just looks like a pebble of sand stuck in a some snail slime. Edit: not sure the video is going to work so here are stills

Can anyone tell me what is going on here? There has been a little bit of stringy stuff around my rocks and right now its spilling out white liquid I did feed it earlier a piece of frozen brine shrimp. Do I need to worry about water changes? Should I do a small water change?

I was doing some poking around to consider fragging some mushrooms and suddenly the mushroom retracted and shrunk, and seemed to spew these semi clear worm tentacles like things. Are these worms in the shrooms or the shrooms tentacles? Thank you all for your support and advice!

Not sure what these are, I just spotted them today on my dry rock that has been in the tank for about 3 months. Only other things in the tank are 2 clowns, urchine, zoa, mix of snails and a xenia coral which btw happens to be right next to the rock that has these things on them. Thanks!

I spotted this 'thing' and I have no idea what it is. It is growing in a couple different spots on this particular rock, the one pictured is by far the longest. It is slightly translucent, brown in color, ugly as sin.