Worms or Parasite?

[Buddiechrist]

Well, this morning I noticed a few of these fellows in my 33g shrimp tank.
I've had this tank running 4 months now but only 1 month since I took the shrimp outta the 90 and put them into the 33.

When the plants were in the 90g I just used sand, but I'd thought for this tank
I used a bag of new ECO complete, than put some gravel on top.




[Maybe 1']

In the 90g I could not find a single one, but have pulled out several now this one the biggest now thinking they were parasites but my friend Tyler is telling me they are white worms but I have no idea.

I'm unable to find and info on parasites that look like these, and almost all the worms look like these guys.

Should I replace the gravel and eco with just sand? or should I just vacuum out the eco and w/e they are?

[Adz1]

they are called planaria and won't hurt anything but are not nice to look at,

[bingerz]

damn...that looks like a huge sucker!! damn! my rule is....if i didn't buy, im killing it!! damn, that's crazy....had to look at it again!

[Ursus sapien]

could you pop off an other photo or two? The head area doesn't look right for planaria (but that could just be the shot and my eyes).