Urgent Nem + powerhead = ???

Help! One of my gbta's walked into a powerhead even though it was nearly completley covered, it appears to have walked through the front where the water comes out. I woke up to the lovely sound of my PH rattleing, fearing the worst. My tank water was extremely clouded, so i did a 60% wc. The other bigger nem looks ok, just mouth protruding a bit cuz it touched some air during the wc. Will my tank survive? Or am i totally screwed?

Also i took the powerhead out and cleaned the anenome out, but im afraid to put it back in if theres still tiny bits of nem left on it or the wrapped around the blade shaft. All there is as far as flow is a 120gph pump, so about a 10x turnover im assuming