Multiple IDs please?

[Mgoc]

Hey everyone. I bought ulva algae from Reefs2go.com and after putting it in my sump, I noticed I had hitchhikers. I pulled them out and took pics of them. I would like to know what they are and how harmful or beneficial they can be since there is a chance I might have missed one or two of them when trying to take them all out

Here is the first one.

Looks like an anemone, maybe Aiptasia? I found two of them

And for the second one my guess is it is a small clam. What do you think?

And the third one is this green worm

 

[Connie]

1st pic is Aiptaisa. I'd get rid of them!
2nd is a bivalve - harmless filter feeder
3rd - Not familiar with that worm, I'd get rid of him too.

 

[Mike J.]

#1 - Aiptasia. #2 is a Limpet. Bivalve = two shells. #3 Some type of ribbon worm. Not a good worm as they are carnivorous.

I'd put everything in that order in observation tank - not in my DT, that's for sure.

 

[Mike J.]

Here's a couple I.D. sites for you: LionfishLair.com - Hitchhiker Guide to your Aquarium
http://www.masa.asn.au/masawiki/index.php/Hitchhikers_Guide_to_the_Reef_Tank

 

[Mgoc]

Here's a couple I.D. sites for you: LionfishLair.com - Hitchhiker Guide to your Aquarium
Hitchhikers Guide to the Reef Tank - RTAW Reefpedia

Great Websites!!! Thanks a lot!!

 

[Mike J.]

You are welcome. Here is another very good one. Fish disease I.D., Coral disease I.D., Hitchhiker I.D.; a very good reference. Chuck's Addiction

 

[Mgoc]

You are welcome. Here is another very good one. Fish disease I.D., Coral disease I.D., Hitchhiker I.D.; a very good reference. Chuck's Addiction

Thanks!!
I'm sure they will be very helpful.