What is this growing in my tank?

[Dr. Jim]

I've noticed a tangled web-like, white, soft, colony of something growing under a JF Raja Rampage. My first thought was some kind of a sponge but I don't recall ever seeing a filament-like sponge. My second thought was monti nudibranchs but this doesn't look like the typical nudibranchs that I had once in the past or like any photos I've seen posted, unless this is some kind of "colony formation" of nudibranchs that I am not aware of. It is also concerning that these are only under the Raja and an Orange Setosa colony which are my only two montipora corals. But, there has been no evidence of damage being done my these organisms.

Here are photos under the Raja:

After the photo, I easily pulled off about 3/4 of this material.

Next is a photo of the Orange Setosa colony. On the top left of the coral, you can see a filament that fell off the Raja as I was putting the Raja back into place:

And then, to complicate matters, on a nearby favia there was this worm-like structure that was attached on one end and easily removed. I believe it is some kind of animal because it has serrated-like appendages along each side; about 3/4". After removing it, I placed it in a container to examine and observe. but I've seen no movement of any kind. So, I have to wonder if it is related to the organisms above in some way:

Any ideas??
Thanks.

 

[dvgyfresh]

Looks like sponges

 

[ying yang]

As you say i think you can rule out any kind of nudi's
Some sort of sponge i believe it is.i cant remember name.but seen it pop up now and then in threads.
That thing you took out tank looks at first glance like a flatworm or some kind bit would also say sponge. I will try see if can find another thread about that filtimous sponge in first pictures for you to see if can get a name for you

Edit : here one thread but no name yet for you.

White transcluscent stringy growth- sponge maybe?

Just found this stuff- popped up seemingly overnight. It's in a low light (until I turned the rock for a pic) moderate flow spot in the tank. Searched the site and I'm thinking maybe a sponge? Any ideas?

www.reef2reef.com

 

[Dr. Jim]

As you say i think you can rule out any kind of nudi's
Some sort of sponge i believe it is.i cant remember name.but seen it pop up now and then in threads.
That thing you took out tank looks at first glance like a flatworm or some kind bit would also say sponge. I will try see if can find another thread about that filtimous sponge in first pictures for you to see if can get a name for you

Edit : here one thread but no name yet for you.

White transcluscent stringy growth- sponge maybe?

Just found this stuff- popped up seemingly overnight. It's in a low light (until I turned the rock for a pic) moderate flow spot in the tank. Searched the site and I'm thinking maybe a sponge? Any ideas?

www.reef2reef.com

YES! Those "sponges" look just like mine. That is a nice relief....I certainly wasn't in the mood for dealing with some parasite. Maybe this is what I get for dosing ZeoVit Sponge Power!

Thanks for taking the time to find that thread and for replying! Much appreciated!

 

[Poof No Eyebrows]

Sponges

 

[Dr. Jim]

I wonder if that last "worm-like" structure is some kind of an egg case??

 

[ying yang]

Im new to reef tanks so experience is low but just trying help you get an id to put your mind at ease and decide what/ if anything to do about it.
Ive always been under impression that sponges are good filter feeders and beneficial to your tanks and some like/ want them but some remove them if start encrusting in or on corals or just dont like look off them.what i read and the few ive had in my tank was very easy to remove.did read an article about why there bad for reef tanks but that was just opinion of one guy.some say dont lift sponges out of water as they take in air and then start to die and some can be toxic but what i see most say is they ok to have if you want them. Im sure someone more experienced will give you a name soon if you intetested.

Five Reasons Sponges Are BAD For A Coral Reef Aquarium | Reef Builders | The Reef and Saltwater Aquarium Blog

Sponges are some of the most remarkable life forms that we can encounter in the ocean. These resilient and diverse ‘creatures’ are not quite single celled, not quite organisms, but colonies of single…

reefbuilders.com

Here is that article with why sponges are bad for reef tanks to get other side of opinion why they bad like clogging equioment.stealing coral nutrients etc but when seen others comment on this thread its mixed reviews off serioysness of what this article saus but interesting none the least.and you very welcone.im new to salt as i say so repkying to you hopefully helps you and gice you little more kbowledge if didmt already kbow but also helps myself learn a bit more as i go ^_^

 

[Dr. Jim]

Im new to reef tanks so experience is low but just trying help you get an id to put your mind at ease and decide what/ if anything to do about it.
Ive always been under impression that sponges are good filter feeders and beneficial to your tanks and some like/ want them but some remove them if start encrusting in or on corals or just dont like look off them.what i read and the few ive had in my tank was very easy to remove.did read an article about why there bad for reef tanks but that was just opinion of one guy.some say dont lift sponges out of water as they take in air and then start to die and some can be toxic but what i see most say is they ok to have if you want them. Im sure someone more experienced will give you a name soon if you intetested.

Yes, sponges are very beneficial. I always seed tanks with as many species as I can and as mentioned, dose with KZ Sponge Power. I also like to put rocks in sump where it is dark and there is high flow. Sponges will grow like crazy in that environment.

 

[ying yang]

From other replys seems like last picture others think sponge also ?
Im not sure but interesting looking indeed.
Sponges/ tunicates as far as im aware have entry/ exit points to let water flow through them ? Has it got any holes at each end and does it pulsate at all ?
I know you said in container it didnt move at all so guess that your answer

 

[ying yang]

Yes, sponges are very beneficial. I always seed tanks with as many species as I can and as mentioned, dose with KZ Sponge Power. I also like to put rocks in sump where it is dark and there is high flow. Sponges will grow like crazy in that environment.

I been doing little research lately on cryptic zones and the benefits of organisms like sponges populating these areas amongst others but little over my paygrade at moment i think best to try master the basic things first and not try run before i can walk so to speak ha ha

 

[Dr. Jim]

From other replys seems like last picture others think sponge also ?
Im not sure but interesting looking indeed.
Sponges/ tunicates as far as im aware have entry/ exit points to let water flow through them ? Has it got any holes at each end and does it pulsate at all ?
I know you said in container it didnt move at all so guess that your answer

No there is no movement. I can't see any openings with a magnifying glass. (I have an operating microscope but unfortunately I just moved and it is still packed in storage).