What are these things??? Read description!!!

[POLARBEAR0871]

I've had these things on my rock for a really long time and I just was able to get perfect pictures of these two things what are they???

These ones here look like little egg sacks???

 

[shorty2545]

Looks like bubble algae

 

[Ingy]

Sponges

 

[POLARBEAR0871]

I just noticed the round egg sack looking ones the other day but the long stringy looking ones are older and I haven't been able to figure them out they grow in the shadows of the rocks

 

[POLARBEAR0871]

Any one have a absolute answer???

 

[Eva1313]

They are sponges. My local aquarium has them in their tank.

 

[POLARBEAR0871]

What kind of sponges are they I've never seen them before but why do they grow in the dark

 

[Eva1313]

They are sponges. My local aquarium has them in their tank.

 

[bribo12]

What kind of sponges are they I've never seen them before but why do they grow in the dark

That's just what they do lol. You will never get a species id on them. Just chalk it up as harmless sponges

 

[POLARBEAR0871]

Ok I mean they add some diversity to the tank I've been curious about these for months because they'd grow in a spot then a few weeks later will be growing in a different spot