Yes the water is conditioned and I did a 100 percent change because the cichlids that were inside had made everything including the sand filthy so I took the cichlids out rehomed them and filled it back up with conditioned water and the next day put the gar in, did that make more sense and the reason I was talking about cycling was because I got a small ammonia spikeIf you have done everything quickly and conditioned your water, I don't see how the "cycledness" of you tank would be affected.
What I didn't get is why you have done this and whether the gar was in the old water before you have done a merely ~100% water change.