Alright, I don't know where to post this question, so it shall go into aquascaping, as it involves my scape. Alright, I found a near perfect piece of wood for my 55 gallon planted aquarium. it is much less bulky then the last one I had in there, it has been outside for years (I found it in my house's front garden, parents said I could have it), so most of the tannins are gone. It still floats, but that is fixable. The problem is that it has an old rusted screw in it that I just can't get out. it is concealable where it is, so could I just leave it? Would that be dangerous to the fish? Plants? Any future invertebrates?