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?
It all depends on what the screw is made of. Stainless steel would be the safest option since it won't rust. Why don't you just try chipping around the area where the screw is and removing it that way.