Got a hitchhiker or unknown critter?? Check here for an ID

[ReeferBean]

Sorry for the bad photo, but it's flat with horns. What is it?

I think its an Elysia nudibranch. ... they eat algae so nothing to worry about.

 

[Mike J.]

You said "flat with horns". Most Elysia nudibranchs are green, but there is a yellow shaded one: The Sea Slug Forum - Elysia subornata
It is not flat and has a "folded" back. My suggestion to you is to catch it if at all possible, put it in a specimen container, then take pictures and identify it. It could be a polyclad flatworm and 99% of them are bad. I learned this lesson the hard way.

 

[PapaDragon]

Thanks for the help. I know the photograph is bad so here are some better ones. Just so you know I found these in the bowl after I dipped a new coral in CoralRX. I don't have a quarantine tank ready, but can set one up if I need to.

 

[Wiz]

Cool looking. What are they? Good or bad? And where did you get the coral?

 

[PapaDragon]

Cool looking. What are they? Good or bad? And where did you get the coral?

Not sure if they are good or bad. I bought it at a lfs.

 

[PapaDragon]

You said "flat with horns". Most Elysia nudibranchs are green, but there is a yellow shaded one: The Sea Slug Forum - Elysia subornata
It is not flat and has a "folded" back. My suggestion to you is to catch it if at all possible, put it in a specimen container, then take pictures and identify it. It could be a polyclad flatworm and 99% of them are bad. I learned this lesson the hard way.

Mike do my new photos help?

 

[Wiz]

Trying to search to help. Omg there are a crazy amount of yellow sea slugs. And they look very similar. You think the black parts on these are there color or what they ate? Lol

 

[Mike J.]

ReeferBean was originally correct. It is a Elysia subornata. Nudibranchs rarely live over a year old and they breed like rabbits in the mean time. I wouldn't want that many in my tank.

 

[Wiz]

The body structure looks the same. But when you google it there are none that match that color. And I dont see any that show what I'm assuming is the food it ate. (The dark areas) just curious, how can you be sure?

 

[Mike J.]

I'm 90% sure, there's always risk involved identifying something without seeing it. They are different colors from the same species. Yes, the coloration you see is what they ate. They are almost transparent and you can see through them. Did your rocks or whatever you introduced come from the Atlantic/Caribbean? Why am I sure? Because I've seen them in person (as have a lot of us, they are pretty common) and have seen them identical to yours.

 

[Wiz]

Kinda jealous. I havnt gotten a hiker in a while. Gotta buy mor lr. Lol

 

[PapaDragon]

@ReeferBean was originally correct. It is a Elysia subornata. Nudibranchs rarely live over a year old and they breed like rabbits in the mean time. I wouldn't want that many in my tank.

So they are bad?

 

[Wiz]

So they are bad?

wet
If u google it, it says they eat various forms of caulerpa. Nothing I can find says they are bad. If this is a correct Id, I think its fine if you don't mind it eating your caulerpa. Hopefully its a correct id.

 

[PapaDragon]

wet
If u google it, it says they eat various forms of caulerpa. Nothing I can find says they are bad. If this is a correct Id, I think its fine if you don't mind it eating your caulerpa. Hopefully its a correct id.

Thanks Wiz. I guess I'll find out.

 

[Wiz]

No problem. Hitchhikers and microlife are my favorite part of reef keeping. Like fishing. The thrill of what you may find makes me happy. Lol

 

[sean9_man]

Found this hitch hiker anemone on one of my live rocks. Anyone know if this is good or bad?

 

[Wiz]

Hard to tellclooks beat up. Maybe a rock nem

 

[lebladp]

Looks kinda like a Duncan

 

[Mike J.]

Looks like a Majano to me.

 

[Wiz]

Its not a majano