I cant believe how many of you think its the water that has to cycle. The cycle in these types of tanks takes place in the bioballs, this is where the bacteria grow. If the bioballs came from an established system, (which they do) Then the system is cycled. The water being fresh and the tank being new has no bearing whatsoever on the cycle. So yes, if you have a large wet dry full of highly populated bioballs and add water and fish then you will be fine. It seems some people have no idea what really takes place in a cycle. The fresh water and new tank have absolutely nothing to do with the cycle.
Ayef12, explain to me your profesional opinion of why this wouldn't work. Since you seem to think that there's some other magical thing going on in a new tank. A cycle is 100% based on the bacteria growing on the media that convert Amonia to Nitrite, to Nitrate, This bacteria grows on the bioballs, thus if the bioballs came from a highly populated tank then they will continue to do there job in the new tank.
Also, who told you that its tap water and not RO water? Just because you see a hose doesn't mean that hose isn't coming from a large holding tank of RO mixed saltwater. I have never seen them mix salt in the tank so clearly the hose filling the tank is pre-made saltwater.