People are going to chew me up for this, but you can find yourself a reputable lfs
and get something called fritz-zyme. I had an ammonia spike not too long ago and freaked out. I went to a good lfs
and the guy, who I trust, recommended this stuff. I bought it, threw it in the tank, all bad stuff was gone by the next morning. Tank has been perfect since. I'm not saying this will definitely work for you. I am not one to use anything but Prime. In fact, I am cycling a tank right now the old fashioned way with seeded gravel and filter media. But I would use this stuff again if I was in a bind. Probably not a good idea to buy online a it does need to be refrigerated.