What is this in sump

[ds1000]

I saw this today gliding across the glass in my sump. Any ideas?

 

[Crabs McJones]

Flatworm, remove it

 

[ds1000]

Okay. Need to find him again lol. What problems do they cause?

 

[Crabs McJones]

Okay. Need to find him again lol. What problems do they cause?

depends on the type of flatworm. We will know more with a closer pic

 

[ds1000]

 

[Gumbies R Us]

Usually flatworms will damage coral, check and see if you have more in your sump!

 

[ds1000]

Any idea on type of flatworm?

 

[ds1000]

Can someone Identify this?

 

[ISpeakForTheSeas]

Can someone Identify this?

Runcina sp. Headshield Slug - good guy:

I'm thinking a Runcina sp. headshield slug - if so, members of the genus reportedly feed on diatoms, so it would be a keeper.

If you do a Google Images search for "Runcina species" you should get a number of good images you can compare with; the (at least mostly) solid white and black stripes forming the collar there can be found a few different species in the genus, but I'm not familiar enough with the genus yet to know which species your specimen might be.

I've been able to find for sure is that they reportedly eat diatoms, algae, and "dead marine phanerogams" (dead seagrass).