Waiting it out is the best way to go. But I can tell you, fritz-zyme works. I stupidly added too many fish to my established community one day, threw my tank into a mini-cycle. I freaked out. A trusted person at a good LFS
told me to use this stuff. He said it would take a couple of days, but I took readings the next day and they were perfect! Tank has been great since. I highly recommend......but it is hard to find because it needs to be refrigerated. Supposedly this stuff is used by commercial aquariums. Look it up, go to their website. You can punch in your zip and they will tell you where it is sold. Don't buy online! Shipping is ridiculous......if it's not, you will get a compromised product.