Does anyone know what this is?

[laezur]

Legitimately looks like some creepy butt alien egg with spikes on it, like Godzilla is about to burst outta that thing.

I have no idea, I can’t even tell if it’s part of the rock because I’m having algae issues at the moment. Had a bit of a green hue to it.

 

[glb]

Legitimately looks like some creepy butt alien egg with spikes on it, like Godzilla is about to burst outta that thing.

I have no idea, I can’t even tell if it’s part of the rock because I’m having algae issues at the moment. Had a bit of a green hue to it.

Is it moving?

 

[laezur]

Is it moving?

Not at all, but I don’t recall ever seeing it and the tank is in my office so I see it 8 hours a day

 

[A Young Reefer]

possibly a Chiton, if so good algae grazers.
This might help: https://www.reef2reef.com/ams/guide-to-common-hitchhikers-in-reef-tanks.861/

 

[ISpeakForTheSeas]

Looks like it could be some kind of bivalve or bivalve shell too.

 

[ScubaFish802]

Looks like it could be some kind of bivalve or bivalve shell too.

If you shine a bright light on it does it close? I was thinking the same

 

[laezur]

If you shine a bright light on it does it close? I was thinking the same

I took the picture with the flash on, it didn’t seem to react in any way. I don’t particularly want to go poking and prodding it but I will if I know what to look out for lol

bivalve is a type of clam, right?

Im seeing so many new creatures recently and I haven’t added anything in months lol, just a few hermits

 

[ScubaFish802]

I took the picture with the flash on, it didn’t seem to react in any way. I don’t particularly want to go poking and prodding it but I will if I know what to look out for lol

bivalve is a type of clam, right?

Im seeing so many new creatures recently and I haven’t added anything in months lol, just a few hermits

Yes to the some type of clam or related (is my best guess) not 100% certain though at all

 

[JoJosReef]

Ocean rocks? Might be a bivalve. Mine have appeared months after putting the rocks in. Try watching it after feeding phyto to the tank to see if it opens up and sends out it's filters. I think chiton would be more oval shaped without the ridges.

 

[ISpeakForTheSeas]

I took the picture with the flash on, it didn’t seem to react in any way. I don’t particularly want to go poking and prodding it but I will if I know what to look out for lol

bivalve is a type of clam, right?

Im seeing so many new creatures recently and I haven’t added anything in months lol, just a few hermits

A clam is a type of bivalve (so are oysters, mussels, scallops, etc.). When they are 'startled', they typically clamp their shell together (like two doors closing together). They have rudimentary eyes, so they'll 'startle' at sudden lights/shadows. Depending on the size of the bivalve and where their mantle (the part with the eyes that opens and closes) is facing, you might not be able to see much of a reaction. If it's dead, you won't see any reaction (a lot of bivalves don't usually do well in our aquariums, so there is a chance it may be dead, but others do fine).

JojosReef's suggestion above is good too. The siphon it would feed with might not be hugely noticeable, but, again, assuming it's alive, you should be able to see some sort of opening/closing response.

 

[SlugSnorter]

very gently poke it with a stick. does it react? is it hard or soft?

 

[ScubaFish802]

A clam is a type of bivalve (so are oysters, mussels, scallops, etc.). When they are 'startled', they typically clamp their shell together (like two doors closing together). They have rudimentary eyes, so they'll 'startle' at sudden lights/shadows. Depending on the size of the bivalve and where their mantle (the part with the eyes that opens and closes) is facing, you might not be able to see much of a reaction. If it's dead, you won't see any reaction (a lot of bivalves don't usually do well in our aquariums, so there is a chance it may be dead, but others do fine).

JojosReef's suggestion above is good too. The siphon it would feed with might not be hugely noticeable, but, again, assuming it's alive, you should be able to see some sort of opening/closing response.

Side note: If you ever want to see something creepy look up images on google of 'scallop eyes' lol

 

[SlugSnorter]

Side note: If you ever want to see something creepy look up images on google of 'scallop eyes' lol

or isopod tounge

 

[PeterEde]

My money is on Chiton

 

[EeyoreIsMySpiritAnimal]

Oyster or other asymmetrical bivalve