Help with worm ID

[PDR]

I have tried searching but have been unable to find anything conclusive.

 

These worms showed up on my glass about a week ago, I cannot seem to spot them anywhere else in the tank. Any idea what they are? Are they harmful?

 

Sorry for the lousy pic.

 

 

 

 

Thanks

[amphipod]

Not harmful and there can be hundreds of choices, most common would be copepods. Several other crustaceans can do that also

Rare case is an epitoke

[PDR]

Not harmful and there can be hundreds of choices, most common would be copepods. Several other crustaceans can do that also

Rare case is an epitoke

 

I thought it might be copepods at first, but when I looked closely, they look and move more like a slug or worm. But as long as they are not harmful then I'm not too concerned about them.

[amphipod]

I thought it might be copepods at first, but when I looked closely, they look and move more like a slug or worm. But as long as they are not harmful then I'm not too concerned about them.

so they are only on the glass, not free swimming? They in that case could be flatworms, also usually harmless.

[PDR]

so they are only on the glass, not free swimming? They in that case could be flatworms, also usually harmless.

 

I looked for them anywhere but the glass for almost 30 min today and couldn't find any signs of them except the glass. I'm more curious where they came from. I haven't added anything to the tank for weeks, never noticed anything, then one day boom all over the place.

[amphipod]

Often things like them will be living elsewhere in the tank, but when they reach a point of their life cycle or have sufficient numbers they come out for visits lol. It shows how diverse life is in the oceans.