Is this a pest?

[sabz]

Do you guys know what this is?

 

[MERKEY]

Without seeing the front of it I am thinking aptasia...or hydroids of some sort.

 

[Greg P]

Kinda looks like Aiptasia or Mojano

Bump

 

[JayLu]

Aiptasia. Kill it!

 

[Dark_Knightt]

I would get rid of it too be safe. Looks mostly like aiptasia. To be honest I thought it was some sort of baby dwarf octopus at first lol

 

[DzungCali]

I would watch its grow and keep my eyes on it.

 

[fishguy242]

yep, take it out..looks like a swimming pest nem poss?

 

[JPM San Diego]

Given the current size (tiny) positive ID would be very difficult. I see 7 tentacles, not 6, which implies it is in the sub-class Octocorallia (8 tentacles) with one hidden. Since it has more than 6 tentacles, I doubt it is in the sub-class Hexacorallia (stony coral). This would suggest baby blue coral, soft coral, or anemone. If you have no blue or soft corals then most likely an anemone. Given aiptasia is so very common, I would venture to say that would be my guess.