What is this (tbs rock)

[ctylermast]

not sure exactly just noticed this, has had rock in tank for about 7 months , but looks like part of rock if you don’t look closely. This is only angle I can really get, but it’s soft and reacts to touch.

 

[RobertK]

looks like a sea squirt

 

[LiverockRocks Verified Sponsor]

Sea squirt filtering water.

 

[BryanM]

One of the many benefits of real live rock... all sorts of life!