I use NO conditioners. What for? Before I give my fishes water conditioners, I'd have to set myself up with some pure Oxygen for the house.
Hey whatever anyone does is fine, Heck, some people feed their dogs Filet Mignon. But I know a lot of reputable Vendors and MFKers that dont use any extra or special chems.
I am not an advocate nor do I boycott chems, but if I ever did decide to use again then I'd buy the Sodium Thiosulfate crystals that you mix up yourself.