Weird looking thing crawling in my tank

Well now I know what a flatwork looks like.. looks like a little jellyfish.

 

This type of flatworm in non-photosynthetic and feeds solely on copepods

 

So now the next question is, do you treat for it? If you have one, you have many......or so I would venture to speculate. Now, I have seen products out there that purport to ridding the world (several gallons at a time) of flatworms. Does this mean that we do this here? Seems to me like you would want to.....since copepods should be kept for fishies......just throwing it out there......as I believe the post was a two question deal.

 

These are not dangerous like aceol flatworms. Their population is kept in check with the number of copepods you have.

I personally would do nothing. A magnet glass cleaner kills more copepods than these flatworms ever could.

 

Now and then I have one craw up the glass, easy to remove with a turkey baster..
The red ones are the bad ones, and I think these eat the red ones..
Or so I read.. For awhile I was getting 4 or 5 aweek out.. Now maybe 1 every 3 or 4 weeks.. Use a turkey baster, give some time.. And see if they don't almost go away..
When I first found one, I said... O good, baby snails.. !! LOL

Larry

 

Thanks guys for all the answers !
Looks like it is an Amphiscolop after all ! After further reading they are harmless to my reef tank.
That was the only one that I saw in there, and it was indeed in a location that was FULL of copecods (hundreds of them). I haven't seen it since then, I did however find a featherduster and a bristleworm in my tank (on my search for more Aiptasia)

 

it looks like the very elusive farmer blow fish. LOL. Whatever it is, you took some pretty cool pics of it.