Can someone identify these pest?

[WVReefJunkie]

I am pretty sure they are flatworms, but I dont think they are the bad ones, an someone clarify that?

 

[homer1475]

Flatworms.

 

[ReeferBean]

Those won't do any harm. Is the tank new?

 

[WVReefJunkie]

Those won't do any harm. Is the tank new?

Yes, fairly new. 4-6 months

 

[Rmckoy]

Funny to see this .
I just noticed I have a bunch of rusty coloured flatworms .
Apparently the rust coloured ones eat pods and rotifers .
along with plankton etc .
I’ll attach a link I was reading

Pests Invading the Reef Aquarium: Part 2 - Flatworms, Snails & Limpets

Over the past decade, the marine aquarium hobby has enjoyed advancements in both technology and information regarding the captive care of live coral.

www.liveaquaria.com

 

[WVReefJunkie]

Acoel Flatworms? Harmless, Detritus eaters?