unknown critter

[kenlo]

hi everyone. im new to this forum and the reason i wanted to join is because im a biginner and im starting to have lots of questions after all the reading i've been doing about saltwater aquarium.
last night i got home and i found this critter on my front glass of the tank. i have never seen it before and try to find similar pics online but still i couldnt identify this critter.
Can someone help me? here is a pic attach of the critter.

 

[kenlo]

can someone help to identify what this critter is in my glass tank?? i just saw for the first time last night whwn i got back home.
thx

 

[aaronalam]

Starmie (Pokémon) - Bulbapedia, the community-driven Pokémon encyclopedia

I assume you mean the thing at the back of the tank? On the left.

 

[kenlo]

is actually in the front glass

 

[melosu58]

Moved to SW ID forum.

 

[mr_X]

it's quite blurry, but i believe it to be a nudibranch. i'm not sure what kind.

 

[kenlo]

It might be. Now I have two. I found tonite another one on my glass. Should I romeve them from my tank? Are they harmless?

 

[melosu58]

Same threads merged together.

 

[mr_X]

hard to say. it depends on what type they are. there are many. when did you start seeing these? do you have any coral in the tank at this time?

 

[kenlo]

I saw them two about 3 days ago. They are really small and I saw them 4 days ago after bringing a frag of star polyps and s leather coral with some button polyps attached to the rock.

 

[mr_X]

well, there are zoa eating nudibranchs that resemble the ones on your glass, but it's hard to tell without a clearer picture.
here, this guy took a few shots-
Zoa Eating Nudibranch Pics - Manhattan Reefs