Agree with FM.  Tap,tap,tap and a bottle a Prime...  (where did that pirate tune come from originally, lol?)
Oh, and my +1 up there was to say that I totally agree with This Old Spouse that you don't -change- biomedia, you just gently rinse it.  Coarse mechanical media (eg. coarse sponges) often also gets rinsed, whereas fine mechanical media (eg. floss or floss pads) often get replaced after a few cleanings.  Chemical media (eg. carbon or zeolite) are optional and temporary, best used for special purposes only in most cases.
You always have to give it a couple days after water changes, it might just be the tap water or it might be a bit of bacterial bloom.  Small increases in ammonia and nitrite following a period of those being zero is the definition of a mini-spike.
~~waterdrop~~