Living grains of sand?

[Renaissance corals]

What are these? I found them in my dry rock cycling tank.
They are about the size of fine sand. At first I thought it was calcium precipitating out until I noticed them moving. They prefer to crawl around or get carried by the current.

(Please excuse the audio on the video) thanks

 

[Miami Reef]

Following.

 

[Reefkeepers Archive]

What are these? I found them in my dry rock cycling tank.
They are about the size of fine sand. At first I thought it was calcium precipitating out until I noticed them moving. They prefer to crawl around or get carried by the current.

(Please excuse the audio on the video) thanks

Uhh, what the heck!?! Can you take one out an take a close up photo or under a magnifying glass. I've never seen anything like this

 

[His Coral Highness]

I’m curious too

 

[Renaissance corals]

Uhh, what the heck!?! Can you take one out an take a close up photo or under a magnifying glass. I've never seen anything like this

I took the pictures from about 3 in away at eight times zoom with a macro lens. I can't really get much closer. I can add this little detail though. They are hard like sand

 

[FoolishWizard]

Seem like lil baby snails?

 

[CoralB]

Looks like something hatched

 

[Rmckoy]

Is it grains or sand ?
Thinking something moving sand

 

[ISpeakForTheSeas]

Do you have any snails in the tank?

 

[AstroCoral]

That is very odd, almost looks like pyramid snails like you would see on an afflicted clam but they seem much more rounded.

 

[Renaissance corals]

Is it grains or sand ?
Thinking something moving sand

I've never seen grains of sand crawl up glass

 

[Renaissance corals]

That is very odd, almost looks like pyramid snails like you would see on an afflicted clam but they seem much more rounded.

Please elaborate

 

[Rmckoy]

I've never seen grains of sand crawl up glass

Me neither …
Sorry I misread

 

[Renaissance corals]

Seem like lil baby snails?

I did have one snail in the tank for a short time

 

[Renaissance corals]

Me neither …
Sorry I misread

It's all good. That's why I included the video

 

[Rmckoy]

It's all good. That's why I included the video

Videos won’t open for me

 

[Renaissance corals]

Videos won’t open for me

The video just shows them kind of waddling like a crab would. They don't move like a snail. It's weird, I've never seen anything like these

 

[AstroCoral]

Please elaborate

Unfortunately, my phone doesn’t allow me to see the video. They appear similar to what small pyramid snails look like on clams. Pyramid snails are harmful to clams but since this isn’t on a clam, I have serious doubts these are pyramid snails.

 

[Renaissance corals]

Unfortunately, my phone doesn’t allow me to see the video. They appear similar to what small pyramid snails look like on clams. Pyramid snails are harmful to clams but since this isn’t on a clam, I have serious doubts these are pyramid snails.

The video just shows how they move they waddle kind of like a crab. They don't swim either

 

[AstroCoral]

The video just shows how they move they waddle kind of like a crab. They don't swim either

That is strange, I don’t have any leads on what would move in that way. They all appear to generally have the same shape, I’m puzzled by this one.