What are these guys

[itsamyheff]

So I was looking over the tank and noticed these guys on the glass. Should I be concerned? What and how do I get ride of if need be? I thought it was a piece if silicone at 1st and then I saw them on the move.

 

[jcook54]

Huh. Before I saw the picture I was sure it was going to be flatworms of some sort. It still could be but they usually have a pretty distinct "U" shape at one end. Google "flatworms" and check out some of the images and see if any of yours has that odd little U shape on one side or the other. I keep going back to the pictures and I really don't think they're flatworms. I'm hoping someone else will chime in and take a shot at it because I'm stumped.

 

[itsamyheff]

Huh. Before I saw the picture I was sure it was going to be flatworms of some sort. It still could be but they usually have a pretty distinct "U" shape at one end. Google "flatworms" and check out some of the images and see if any of yours has that odd little U shape on one side or the other. I keep going back to the pictures and I really don't think they're flatworms. I'm hoping someone else will chime in and take a shot at it because I'm stumped.

I was leaning to flatworms as well but these are long and skinny.

 

[Doberman13]

Could it be a type of nudibranch? What fish do you have in the tank? Whatever they are I would think that a wrasse or damsel would eat them.

 

[itsamyheff]

1 lonely watchman goby. All the fish are still in quarantine. I tried pulling one out. I wasn't successful. I just cut it in half and now I have multiple pieces on the move.

 

[dball711]

It's hard to tell for sure viewing from the bottom, would love to see a top view with it's eyes. It looks like a rhabdocoela flatworm.

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[jcook54]

I really, really like @dball711 opinion for two very important reasons. Well, maybe 3 reasons. First, it sure looks like them! Second, if He's correct, they're harmless! Third, I was stumped and with his suggestion I can do a bit of research and potentially learn something

Are you planning on a wrasse of any sort? Wrasses are great at nuisance critter control (nudi's, flatworms, etc.) but I've also used Sapphire Damsel's to great effect on smaller tanks.

 

[timeconsumer]

I would also like to see a top view on the offchance it isn't a flatworm or nudi but could be a sea slug. If so I know a guy who would very likely buy them off you.

 

[itsamyheff]

I haven't seen another one till tonight. Here's a pic.

 

[itsamyheff]

How do you add video?

 

[The Wyld Zone]

Looks like polycladida or tricladida.
I don't see any distinguishing features to suggest a nudibranch or slug.
No parapodia, no cerata, indistinguishable mouth, I didn't see any rhinophores either. The body lacks a uniform rigidity common in slugs and nudis. Looks similar to a species of invertebrate eating flatworm I find in mud from the Atlantic.
Overall I'd watch these. They appear to be pests.

 

[itsamyheff]

Looks like polycladida or tricladida.
I don't see any distinguishing features to suggest a nudibranch or slug.
No parapodia, no cerata, indistinguishable mouth, I didn't see any rhinophores either. The body lacks a uniform rigidity common in slugs and nudis. Looks similar to a species of invertebrate eating flatworm I find in mud from the Atlantic.
Overall I'd watch these. They appear to be pests.

Any suggestions on something to combat these? We will be adding a couple lepord wrasse at some point. Right now we only have a yellow watchman goby. Others are still in quarantine.

 

[The Wyld Zone]

Any suggestions on something to combat these? We will be adding a couple lepord wrasse at some point. Right now we only have a yellow watchman goby. Others are still in quarantine.

No unfortunately not many suggestions. Polycladida or tricladida (if they are) are much harder to deal with than most other flatworms. You would have to have a predator for the adults and a predator for the juveniles and eggs.
It's certainly possible a wrasse may eat them. But I'm not particularly familiar with fish.

I have some methods of responding to them, but none that I feel are well tested enough to speak about.

 

[dball711]

Neither of these...polycladida or tricladida

 

[itsamyheff]

I wish I could post the video I got. I don't know how.

 

[hzheng33]

I wish I could post the video I got. I don't know how.

post it to youtube and then share the link.

 

[itsamyheff]