Unknown creature.

[user17482]

This flatworm looking creature came off my lettuce nudibranch. I purchases this nudibranch about a month ago not really any problems with it until now. When I was checking the tank a lunch it looked as if it had laid eggs. About 3 hours later this thing has been moving around the tank. The nudibranch looks thiner and has been slightly dormant. A potential cause is a major drop in nutrients, I had really high phosphate and nitrates and have been recently getting them down. If you've experience anything like this please share.

Thank you!

I apologize for the bad images but the first one was of this thing first coming of the nudibranch an the current update ( Also the thing is very thing and has remained at the top of the surface)

 

[WalkerLoves_TheOcean]

Hard to see because it's in blue light, but it looks to me like a acropora eating flatworm.