What is this thing?

[Soccernut5824]

Spotted this guy on my glass tonight, never seen one before.
Redish orange on the sides with a purple head.
About 4mm long and 1mm wide

Moves like a Catapillar.

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[mcgyvr]

Not really the best picture but looks like a flatworm..
https://www.lionfishlair.com/hitchhikers-guide/

 

[swhobbie1]

Flatworm .

 

[reefinder]

Flatworm, get a six line wrasse and you'll never see them agian. Don't use chemicals to get rid of them go all natural.

 

[SRQreef3r]

Flatworm, get a six line wrasse and you'll never see them agian. Don't use chemicals to get rid of them go all natural.

This

 

[TwentyfiveCents]

Flatworm - you can get a wrasse and there are alot to choose from....just make sure you do research and dont get one that outgrow the tank or one that is too agressive