Hi sounds annoying ,as Fido says they're made of meatier metal than used now so don't think you'll pull it out , depends on whereabouts but could you get a piece of wood inside against the side and manipulate a lever through the filler hole to lever it out ,probably the return pipe will hinder but just a thought ,if not you can acheive a great finish with filler and spray cans , just have to take your time and as a bonus 'cause it's the flat sided tank you could use a detail sander to great effect , why not post some pictures ? oh and just to feel a little better get even with the plant pot ,a good whack should do it ,although not if it's the bosses at least not when she's around !! best of luck BobH.