What is this???

[nyprdr]

I have this white web-like stuff on my live rock.. i pulled the piece from the bottom of my sump... also anyone know the name of that plate coral there and does it look ok? I plan on asking the person who sold me the coral that question so i really only care about whats on the rock.. thanx

 

[crox99]

Spaghetti worms?

 

[KathyC]

If you first question is regarding the upper rock - that is sponge and it's fine to have, it often grows on the underside of rocks in our tanks.