Sponge? What is this?

kaylajoy

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The white tubules next to the snail... I know they are alive because they change over time. Last week they appeared to die back to a sort of brown flesh and now the white tubes are back.

They don't appear to move or have any sort of polyp inside the tubes.

The purple thing they're growing on is just a coralline algae skeleton.


IMG_20210519_110835.jpg



Another pic showing multiple patches...

IMG_20210519_111411.jpg
 
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kaylajoy

kaylajoy

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What type of snail is it? They look like snail eggs.

I thought they were eggs at first too, but I don't think eggs would shrink down and disappear, then reappear in the same spot within a few days.

It's not clear in the picture, but the tubules are all connected by some sort of flesh, like it's a colonial organism.

The snail is just a stomatella.
 

Smirkish

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Snail eggs, for reference. They would be attached in mats. I’m not sure about the changes you saw, though. Hopefully someone can come through with a better ID.
 

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Are they like this?
 
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kaylajoy

kaylajoy

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Are they like this?

Similar.

Heres a picture of them unhappy to show they are definitely not eggs:

IMG_20210524_112057.jpg


Not exactly sure why they do it. They seem to do it after I dose phosphate for the algae, so maybe sensitive to that, but at times it appears to happen randomly.
 

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