omg. so the past two weeks, all my fish died after a water change. also my tank received an ammonia spike. the spike went up to a 4.0 and right now it's about an 8.0. There is no fish in the tank so i'm just hoping it just cycles again and gets rid of ammonia on its own. Today i also did an ammonia test and the tap had ammonia in it. It read at 2.0ppm. What the heck am i supposed to do about my tap system?