White flat "thing" with black spots on frogspawn stem

[filter]

What is this thing? Its very hard and doesnt move.

 

[Fragologist]

Wow no response since August of 23. That look like a Chromodoris orientalis (black and white sea slug). However I do not see the light brown, tan or orange structures generally found on this organism. Given that is correst, they have various feeding methods and are generally carnivorous. They feed on sponges, hydroids, bryozoans, entoprocts, and ascidians. These are all small filter feeding organisms so most hobbyist corals should be safe.

 

[filter]

thank you for the response. It never moves and is hard like a rock? Wouldnt a sea slug move about?

 

[ISpeakForTheSeas]

thank you for the response. It never moves and is hard like a rock? Wouldnt a sea slug move about?

Yea, a sea slug would move about, and most sea slugs wouldn't be rock hard either. Any chance you could take the frag out of the tank to get some closer up, clear pics of the thing in a container of tank water?

 

[filter]

sure. Here you go. I just took him out. It does seem to be peeling on the one side but its hard.

 

[ISpeakForTheSeas]

sure. Here you go. I just took him out. It does seem to be peeling on the one side but its hard.

I'm not sure on this one; I'd guess a bryozoan of some kind, but I'm definitely not confident on that.

 

[Kasrift]

Random guess, but could it have been a plating type corraline algae that died? Mine in the tank that gets shaded out or died has strange colors.

 

[filter]

interesting. I will update on what happens with it. Maybe the peeling will continue and it will fall off.

 

[ISpeakForTheSeas]

interesting. I will update on what happens with it. Maybe the peeling will continue and it will fall off.

How long has it been there, and has it been growing at all?

 

[filter]

How long has it been there, and has it been growing at all?

I dont see any growth. It must have come with the coral.