What is that!! A R2R guide to common new tank hitchhikers.

[Lovemyreef2015]

First picture looks like a dorvilleid worm. Good guy.

 

[Williamson’s Reef]

First picture looks like a dorvilleid worm. Good guy.

Awesome! Thank you!

 

[erdrick80]

Hello, I'm new to this forum and came across one of these hitch hickers you mentioned... and also want to thank you for posting them. I believe it's a gorilla crab I have. I try taking a pic but he barely comes out. Only saw him today when I was feeding for few seconds.. He's a bout the size of my emerald crab, which is the size of a dime coin.

The crab is white in color, almost clear.. I didn't even notice him since I started up my tank 2months ago. My question is... how do you go about getting him out? so far he hasn't harrased anything. My peppermint shrimp still alive and all my corals and clowns/royalrgramma are fine. Don't have many corals but so far so good. Or should I just let him be? he is under the small live rock where the xenia's are in close up picture below. I also have a full picture of my 46bow tank so you can see if he has enough space to not be concerned about him bothering fish in future if that makes sense.

 

[Joe.]

Can anyone I'd this hitchhiker on my snail?

 

[Crabs McJones]

Can anyone I'd this hitchhiker on my snail?

Fan worm. Harmless filter feeder.

 

[Joe.]

Fan worm. Harmless filter feeder.

Thanks for your help bud. I'm a newb.

 

[JDR3886]

Im fairly new to the hobby and I just saw this little guy on the glass. I have never seen anything like this in my tank and I have not purchased any new fish or corals in a few weeks. Does anybody know what it is?

 

[KJ]

Elysia sp. (Caulerpa Slug)
https://www.google.com/search?q=ely...Q_AUIBigB#safe=off&tbm=isch&q=elysia+aquarium

 

[JDR3886]

It defintely resembles those slugs. From what I read they dont seem like a nuisance so thays good. Thanks for info.

 

[Prestomagic17*]

They look cool!

 

[FishyFish]

Hello! Brand new hobbyist here, I just found these little shrimp bugs in my tank, can anyone please help me ID them? They looked like amphipods maybe but I thought pods were smaller than this so I'm not sure.

 

[FishyDP]

Thank you!..great post. I am saving this list for whenever I get an unknown "visitor" in my tank

 

[Millimylilly]

It’s hard to tell scale from the picture but it looks like those could be amphipods, or some sort of shrimp/larvae

 

[Lovemyreef2015]

Hello! Brand new hobbyist here, I just found these little shrimp bugs in my tank, can anyone please help me ID them? They looked like amphipods maybe but I thought pods were smaller than this so I'm not sure.

They are gammarid amphipods. Good cuc and bonus fish food

 

[FishyFish]

They are gammarid amphipods. Good cuc and bonus fish food

Phew! That's definitely a relief, thanks a bunch!

 

[Matt Carden]

I think this is Apstasia. Want clarification before I kill it.

View attachment 15492254940491210739630107101751.jpg

 

[Lovemyreef2015]

Phew! That's definitely a relief, thanks a bunch!

You're very welcome

 

[Lovemyreef2015]

I think this is Apstasia. Want clarification before I kill it.

View attachment 15492254940491210739630107101751.jpg

You are correct, that is a aiptasia. Bad

 

[Ronny Bello]

I think this is Apstasia. Want clarification before I kill it.

View attachment 15492254940491210739630107101751.jpg

Or peppermint shrimp food

 

[Matt Carden]

How long does it take for them to get out of control? Right now it's 2 of them with 3/4- 1" tentacles maybe 2" fully extended. I don't have any corals for them to kill yet.