What’s on the frag plug

[New&no clue]

I just got a trachy and on the frag plug was something weird. Hard to see in the picture

 

[tnw50cal]

start of coralline algae-----hard to tell--is it flat?

 

[New&no clue]

No it’s raised, it almost looks like half a tiny scallop shell, with some sort of brown tentacles coming out. I don’t think they are brown tentacles, just kinda looks like that.

 

[Peach02]

Looks kind of like a barnacle to me, I would remove them they are starting to cover one of my hermit shells

 

[Lovemyreef2015]

Can you tilt the frag plug to get a better picture of it? With white lights on.

 

[Pmauro55]

Not sure barnacles are necessarily a bad thing unless they get out of control, they are filter feeders, never seen them in a home aquarium

 

[New&no clue]

I will take some more tonight at different angles and see if I can get something that looks better.

 

[jeffchapok]

I have one of these on a frag as well. I just assumed it was a sponge.

 

[Lovemyreef2015]

I'm definitely curious to find out what it is if it has tentacles coming out because from the picture it doesn't look like anything but a mark.

 

[New&no clue]

Here are some pictures out of the water

 

[reef lover]

Looks like half a bivalve...
Could be a slipper limpet.

 

[BloopFish]

Looks like half a bivalve...
Could be a slipper limpet.

Darn you beat me to it. I think it's a slipper limpet to, or something of that sort. The description of the brown tentacles rules out barnacles and makes limpet the more likely choice. I used to have many hermit crab shells covered with them, they'll often slip out slightly ("tentacles" are likely its antennas and mouth) to chew at something near the rock. Completely harmless if it is a slipper limpet.

 

[New&no clue]

slipper limpet.. that’s a new one, had to google it;Bookworm. Thank you both for the info