Transparent strings on coral?

[justinr12330]

Can anyone tell me what these are?

 

[homer1475]

Feeder tentacles, or its their stinging tentacles? This is a leather, no?

Perfectly normal either way.

 

[Arthacker87]

Yerp sweeper tentacles. Helps fight off other coral growth I think. At least my corals sting each other to death lol