Try the magnet trick first, but if you can't find it, I wouldn't worry about it at that point. Just be careful if you do find a better reason to tear down your rockwork.

My guess is that it will rust until it is completely covered and then it will just sit there since the core metal will be protected b the rust layer from oxidization. or it will just completely corrode. either way i dont think anything bad will come of it except maybe an iron induced algae bloom.

I have never had this happen to a SW tank because I am new at it...

I have had it happen in a FW tank though, I used one of those long poles that bend for picking up nuts, bolts & tools when they fall in around your engine while working on your car (hard to explain - go to the link). As far as the blade not being magnetic – test another blade that you have in the pack of blades on a magnet & that will save you some time...

Hope that helps!


https://www.expeditionexchange.com/t...n001%20041.jpg

Good luck hunting for it, just be careful that you dont cut your self.