Can someone help me identify this?

C

cruizbran

• May 6, 2026

• #1

While I was cleaning my tank I found this little guy. Is he a pest? I am thinking nudibranch, but someone told me that if it’s not white it may be eating my corals.
I’m adding photos from what it looked like inside and outside the tank.

 

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redfishbluefish

Officer Emeritus

Officer Emeritus

• May 6, 2026

• #2

Looks like a zoa eating nudi! Some confuse it with a berghia nudibranch which tend to be whiter, larger and have more "legs." The other sign is if you have zoa's they tend to close because of the nudi's eating them.

 

Ultimate Corals

Sponsor

Gold Sponsor

• May 6, 2026

• #3

It's a nudi that's eating something red. Possibly zoas. I would look into getting either a yellow coris wrasse or a melenarus wrasse in the tank. They will continually eat them so the numbers ween out.

 

C

cruizbran

• Yesterday at 8:49 AM

• #4

redfishbluefish said:

Looks like a zoa eating nudi! Some confuse it with a berghia nudibranch which tend to be whiter, larger and have more "legs." The other sign is if you have zoa's they tend to close because of the nudi's eating them.

Click to expand...

Thank you! I removed it and it seems like it was eating my Montiporas!

 

C

cruizbran

• Yesterday at 8:50 AM

• #5

Ultimate Corals said:

It's a nudi that's eating something red. Possibly zoas. I would look into getting either a yellow coris wrasse or a melenarus wrasse in the tank. They will continually eat them so the numbers ween out.

Click to expand...

Thank you! I removed it and it seems like it was eating my Montiporas!

 

Haus

NJRC Member

• Yesterday at 9:13 AM

• #6

Good chance there are more in there. I’d consider a wrasse as recommended above.

 

B

Boehmtown

NJRC Member

• Yesterday at 9:29 AM

• #7

If they are eating your montis. Just get rid of your Monti's for at least 7 months. Right in the trash. The wrasse won't get rid of them. You can't sell or share your Monti's. Your montis will never grow or color up right. Just make sure. I'm no nudi expert. And the aptasia eating ones look similar. The berghia after good guys and harmless to anything but aptasia.