I am setting my tank up for newts (fire belly) I was planning to add Tetra Aquasafe to treat the tap water and Bacterlife to help get the filter going and protect against new tank syndrome (as I would with fish), however someone in the fish shop said this was not a good idea for newts and they don't react well to this water treatment.
I've heard something similar to this a while back, can't remember exactly what it was but I think it was to do with the trace metals of some kind in the treatment.