Anyone know what this is

[Eserr33]

I found this on my reef tank glass.Do not know what it is? Does anyone have any ideas here is a picture

 

[Reefer508]

Looks like a nudibranch. Any montipora in your tank?

 

[Mike Lemming]

+1 for Nudi

 

[Eserr33]

Looks like a nudibranch. Any montipora in your tank?

yes 3 of them

 

[Reefer508]

Watch them for signs of regression, bare spots with frilly edges. Do a web search for Montipora eating nudibranch.

 

[Edward]

Looks like a nudibranch. Any montipora in your tank?

+1

Check this thread out on reef2reef

Montipora eating nudibranch ID, treatment, and prevention

Identification: Montipora Eating Nudibranches are a fairly common aquarium pest that will feed on any montipora species and even some others like select chalices, scrolls etc. There are over 2000 known species of Nudibranchs and all of them have very select diets. They were each put on this...

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