can someone identify?

its a flatworm without a doubt. some people have great problems with them but I have had what appears to be the same ones you have although they may not be as there are hundreds of different ones. The ones I have have never become large in numbers and never bothered anything. heres a not to clear pic of mine, but you'll see its the same thing.
24791flatworm.jpg
 
Yes if you see them on the glass or easy to reach places get them out, but i would'nt go knocking corals over in an atempt to get at them. I beleive syphoning them out has been a good option for some people.
If they were coloured in my tank i would be in more of a rush to get rid but i personally have never seen theses clear worms multiply in numbers like say the red planaria. These clear worms have been in my tank for 3 years and i have never seen more than about 10 at the same time, but it does'nt mean they definatly wont in your tank unfortunatly.
 
If you have a big enough tank, a spotted mandarin will absolutely decimate the population of those. They need lots of pods, so take my advice and make sure it's eating frozen before you buy it.
 
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