Any idea of what this may be? Pictures...

[Rendos]

It is growing on the underside of a montipora colony.

I thought it was a tunicate at first, but I am not so sure. It is almost completely transparent. It opens and closes when something touches it.

Anyone???

 

[greenbean36191]

Yep, it's a tunicate.

 

[d9sccr]

I've never had one, but it def looks like a tunicate

 

[bluenassarius]

yep a tunicate