can a razor blade lost in tank mess with the water?

very very very weird.. cant find the razor blade. I tore apart the rocks on the side of the tank it dropped. I guess it slid to the other side of the tank. Just weird.
That salt is NOT for me. I get distracted while i'm measuring out the different components. I even almost mixed part a and b together. I actually did, but knew it b/c it all fell out of solution. This happened because I ran of of A in one bottle and switched to another (ended up being B). During scooping of the salts I'll miss count, or I might use the wrong measuring scoop, it's the not knowing 10000% because you cant know 10000% what you did for sure that's making me second guess if I have the proportions right. My corals do look marginally better today, it's only been 8 hours since the change. I know it's a great salt, but just not for me.
 
How do I know if the razor has zinc? I'm actually thinking it does b/c it rusts so easily. And I cant find the damn thing in the tank! Things still dont look great after the major water change. **are blades with zinc attracted to magnets?

I posted before and after of the rzor blades. The one on right is after 1-2 times of use, I dont think I rinsed it with fresh water after. But you can see its completely rusted except the top.
thanks!
 
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