What is this? Shell?

[SimplisticDesign]

Cleaning the tank today, and noticed this. Never seen this before, tried reverse imaging and nothing popped up. I have turbo snails, is this it’s Skelton ? I only have 3, and I am looking at all three. Not sure what’s going on.

 

[vetteguy53081]

Cleaning the tank today, and noticed this. Never seen this before, tried reverse imaging and nothing popped up. I have turbo snails, is this it’s Skelton ? I only have 3, and I am looking at all three. Not sure what’s going on.

Looks to be a sundial and undesired

 

[SimplisticDesign]

Looks to be a sundial and undesired

Is it dead? It’s completely rock solid. That explains why my zoas have suddenly parished…

 

[Spare time]

Its the former cap of a snail.

 

[tbrown]

It is not a sundial, it is an operculum. As mentioned by @Spare time it's the "cap" or "door" of the snail's shell. The snail is dead, that's the only part that won't typically be eaten.

 

[vetteguy53081]

Is it dead? It’s completely rock solid. That explains why my zoas have suddenly parished…

Could also be the cap of trap door of a snail shell. as for zoas, too much light or water flow, sudden change of parameters and even use of vodka or carbon dosing especially if adding NoPox that reduces nitrate quickly. Assure salinity and Phos has not become elevated.

 

[ISpeakForTheSeas]

Yeah, as mentioned, it's the operculum of a dead snail - the operculum is the body part the snails use to close themselves into their shells and "shut the door behind them".