Drill bit dropped into my tank

[Midway]

I know very dumb. was trying to unscrew something above the tank and of course, drill bit dropped into the tank. Now, it has been there for a week or so. The thing is that it fell right in the back of the tank where all my rock are. I have to remove a fairly amount of rock to get to it. Should I bother? I know that thing is gonna start rusting away soon.

Thanks for your advice.