I don't think skimmer and water conditioner can be used to provide the same outcome...
Skimming is used generally to remove organic material (some believe protein) from the water column of an aquarium which is already running (however not 'fully' established).
Water conditioner is from what I understand a commercial term for removing chlorine (which is added to water by your water supplier) which kills bacteria and or parasites in water to make it suitable for drinking purposes or potable so you can use it as a top off for evaporation or in the use of mixing synthetic salt mixes.
You can condition water by simply leaving it stand for a couple of days (surface area dependant) as the chlorine will evaporate naturally (unless it also removes\neutralises\magically eliminates other contaminates) and is (sometimes) also marketed as generally providing a type of protective coating to your livestock... if it makes you feel good.
Conditioning and skimming are not associated.
Did you even read the original post? :duh: