Very thin white slug

[tygates10]

This just showed up today in the glass. I have no idea what it is. Very thin, long and white. I put some berghia nudibranchs in about a month ago and thought it may be eggs but now it’s moving around. Any ideas?

 

[WalkerLovesTheOcean]

It looks like one of those euphyllia eating flatworms. I am not to sure though.