Large unidentified flatworm

[Hemmbone20]

Does anyone have an idea of what this is? It’s about 1cm long and moves very fast. Some type of flatworm?

I recently received some TBS rubble for my sump.. just want to make sure this isn’t a bad critter.

 

[Hemmbone20]

Here is a video with a little better view

 

[AlyciaMarie Verified Admin]

@ISpeakForTheSeas, any ideas?

 

[ISpeakForTheSeas]

Does anyone have an idea of what this is? It’s about 1cm long and moves very fast. Some type of flatworm?

I recently received some TBS rubble for my sump.. just want to make sure this isn’t a bad critter.

Yeah, unless it has a shell hidden in the middle there, I'd guess it's a polyclad flatworm of some variety - almost certainly not a keeper (at best, it'll starve; at worst it'll eat tank inhabitants).

 

[Hemmbone20]

Ok. I’ll attempt to remove next time I see it.. thank you for the reply..

I’m disappointed in my TBS rock so far. First cirolanid isolods now this… more bad hitchhikers than good ones in my opinion.

Yeah, unless it has a shell hidden in the middle there, I'd guess it's a polyclad flatworm of some variety - almost certainly not a keeper (at best, it'll starve; at worst it'll eat tank inhabitants)

 

[ISpeakForTheSeas]

Ok. I’ll attempt to remove next time I see it.. thank you for the reply..

I’m disappointed in my TBS rock so far. First cirolanid isolods now this… more bad hitchhikers than good ones in my opinion.

Yeah, there's always that risk with live rock unfortunately. Hopefully the rest you find turn out to be good for you!