What kind of worm is this?

[sstones]

I have had my 75 gallon reef tank running for about 8 months and today I saw what looks like a green catterpillar on the bottom. He is a light green color, about 1/2 inch long with dark eyes. He uses his tail end to swim on the bottom. Does anyone know what this is?

 

[symon]

Sounds like a sea cucumber, But hard to tell without a pic!

 

[sstones]

I tried to get a pic but its so small I have not been successful. Thanks for the info.

 

[stanlalee]

if it has eyes or swimming with a tail its not a sea cucumber.

 

[bang guy]

Sounds like mosquito larvae.