Identification Please

[Kinorain]

Hello, I’ve noticed these clear hollow structures very slowly growing in the deeper pockets of my rock work. The tanks been up for 2 years now and they are finally getting large enough to see in pictures. Not confined to any one location or rock, but vary in size among the rock works. Can anyone identify what this is?

 

[JGT]

Sponges.

 

[vetteguy53081]

Hello, I’ve noticed these clear hollow structures very slowly growing in the deeper pockets of my rock work. The tanks been up for 2 years now and they are finally getting large enough to see in pictures. Not confined to any one location or rock, but vary in size among the rock works. Can anyone identify what this is?

Clatharina sponge which is a poriferan sponge and can continue to climb and grow. While harmless, I generally remove it in my tank
Best method is a dental pick or small crochet needle and slowly pull away until loose

 

[Kinorain]

Wow, you guys are awesome and quick. Thanks! I’ll leave it alone for now but I’ll keep an eye on them if they happen to grow out of hand.