Film with Black dots

[Existence295]

Hello Reefers, I’ve recently noticed a type of film with black dots on my zoas. Only can be seen during night time due to the zoas closing up a little. I’ve recently seen this on a part of my rock work now. Any help identifying would be great.

 

[Existence295]

Added some better pictures.

 

[Existence295]

@vetteguy53081

 

[vetteguy53081]

Hello Reefers, I’ve recently noticed a type of film with black dots on my zoas. Only can be seen during night time due to the zoas closing up a little. I’ve recently seen this on a part of my rock work now. Any help identifying would be great.

Does not look like any zoa disease/pox ive seen and with series of holes wonder if these are burrowing worms or bite marks from nudibranchs. Take a flashlight to the stem and see if there are any nudibranchs or movement at the stem surface

 

[Existence295]

Does not look like any zoa disease/pox ive seen and with series of holes wonder if these are burrowing worms or bite marks from nudibranchs. Take a flashlight to the stem and see if there are any nudibranchs or movement at the stem surface

I’ve been monitoring them at night for about 15 minutes at a time and I do not notice any movement of nudibranchs. I do have a small amount of Asterinas in the tank.

 

[vetteguy53081]

I’ve been monitoring them at night for about 15 minutes at a time and I do not notice any movement of nudibranchs. I do have a small amount of Asterinas in the tank.

Asterina is also possible.

 

[Existence295]

Asterina is also possible.

But this would not explain the spot on the rock work.

 

[ISpeakForTheSeas]

Added some better pictures.

Colonial tunicates maybe?

Edit: Some you can compare against that look like they might be relatively close in appearance - if you don't think it's a colonial tunicate species, then a sponge of some kind would be my next guess:

Aplidium nordmanni Sea squirt

Aplidium nordmanniis commonly referred to as Sea squirt. Difficulty in the aquarium: Not suitable for aquarium keeping. Toxicity: Toxic hazard unknown.

www.reeflex.net

Diplosoma listerianum Jelly Crust Tunicate, Gray Encrusting Compound Tunicate, Jelly-crust Ascidian

Diplosoma listerianumis commonly referred to as Jelly Crust Tunicate, Gray Encrusting Compound Tunicate, Jelly-crust Ascidian. Difficulty in the aquarium: Not suitable for aquarium keeping. Toxicity: Toxic hazard unknown.

www.reeflex.net

Diplosoma spongiforme Jelly-synascidian

Diplosoma spongiformeis commonly referred to as Jelly-synascidian. Difficulty in the aquarium: Experts only! Very hard to keep.

www.reeflex.net

Distaplia bermudensis Sea squirt

Distaplia bermudensisis commonly referred to as Sea squirt. Difficulty in the aquarium: Not suitable for aquarium keeping. Toxicity: Toxic hazard unknown.

www.reeflex.net

Sigillina signifera Green Ringed Ascidian

Sigillina signiferais commonly referred to as Green Ringed Ascidian. Difficulty in the aquarium: Not suitable for aquarium keeping. Toxicity: Toxic hazard unknown.

www.reeflex.net

 

[vetteguy53081]

But this would not explain the spot on the rock work.

On the rock, im seeing pineapple sponge. These are short lived and will dissipate as silicates reduce. You can peel them off with the edge of a credit card into a net if they are too many. They are harmless and feed off algae