Lettuce Nudibranch vs Powerhead

[jabell]

I just bought a lettuce Nudibranch. After acclimation I tried placing him in tank. Unfortunately he never attached to anything and was immediately pulled into my gyre. He was shredded to bits. The fish are some of him. It's only a 40 gallon tank. Should I go ahead and do a large water change or just wait and see how my tank handles it? I'm assuming my filter sockets a be skimmer should take care of most of it.

 

[samdizshiz]

Imo and others do a water change some say they are toxic but i dont belive so but hey wat can it hurt do a water change better safe than sorry