What happened to our fish?

[Dante]

Howdy all,

New here and already have a question.

Today I noticed that our Royal Gramma appears to have a chunk torn from her (we call her Emma) tail fin. She had no marks before today. Ours is a nano reef so not many possible culprits. What might have caused it? Oscellaris clown, cleaner shrimp, hermit, power head intake, sickness? Any thoughts?

TIA.

 

[reefsnreptiles1]

Could be a mantis shrimp. Have you heard any clicking noises coming from the tank? Other than the hermits are there any other crabs in the tank?

 

[Dante]

No other crabs (that I'm aware of). I have not heard any clicking noises but I'm not sure what a mantis click sounds like. Someone suggested a large bristleworm might be capable. The Royal Gramma does hide in the rockwork quite a bit.

 

[Anonymous]

It could have been almost anything. I wouldn't worry, assuming the Gramma is healthy it will grow back quickly.

 

[TZL]

how big is the hermit?

a hermit ambush might have happend while the Royal was sleeping among the rockwork at night.

 

[Anonymous]

If the hermit is anything but very samll, I would put my bets on him.

I doubt it was a bristleworm, most (all??) don't even have teeth, they can't attack a healthy live fish.

None that could go undetected in a nano anyway.