Sea sponge show off thread

[Cnidoblast]

Just want to see others sponges either intentionally introduced or stowaways on live rock
I got something growing on my live rock that's massive but not certain if it's a sponge or a sea squirt since it has a siphon

 

[NowGlazeIT]

 

[luisgo]

This sponge just grew from the live rock!