If he came from Petco, he was likely on f/t (frozen thawed)...hope so, but your're wise to think ahead, just in case.
I think we have a few members here in the Seattle area, I hope they chime in with sources for you.
No, don't fish him out...he doesn't look too bad in that photo...but he was probably eating mouse fuzzies & should have been on mouse HOPPERS to start.