I've never seen any benefit of those that say they 'add to the slimecoat' etc., personnally.
My local tapwater is treated with chloramine, so I use a conditioner that says it treats chlorine, chloramine, and detoxifies ammonia and heavy metals, since breaking the chlorine from chloramine leaves the water with ammonia in it. Nothing like doing a water change and ADDING ammonia because the conditioner didn't do enough!