As stated I did one copper treatment in the tubs and now that I think of it I also did a prazipro treatment in the tubs
I do have a 300g tub which has been sitting outside for a few years now, I do not believe it has ever had copper in it. The tub is owned by aquarium etc.
I didn't set the tubs outside today, forgot to do so before I left. I can put them out later this evening or tomorrow if out decide you want them