So I'm relatively new to the hobby but consider myself knowledgeable enough to understand the basics. Off the bat, I got a 10g tank about 2 months ago. To make a long story short, we got some bad advice in the beginning, killed a bunch of fish, but thought we had everything sorted out. The following has been going on for almost a month now. 10g tank with Aqueon quiet flow, 2 guppies, 2 moss balls and some nonsense decorations as well as a rock from a friend being used to hopefully seed the tank: I've been using the API master test kit to measure everything regularly (every other day if not daily). pH generally reads low 7, Nitrites and Nitrates read 0 but Ammonia is off the charts (maxes out at 8ppm?). Do a 50% water change, wait an hour, retest Ammonia, and its still off the chart. We then cut back feeding to every other day, with 25% water change daily, testing daily and again our ammonia is too high to read. I have a couple friends who are exponentially more experienced with aquariums than I am (one with an aquaculture degree) and they're all as confused as I am as to why I'm having so much troubles with this tank. Someone recommended that I should just do a full water change, "bleach the tank," and start over. Another said I should do a 99% water change and change filters. I'm looking for any ideas as to a) what's causing such high ammonia even after large water changes and b) ideas/suggestions as to what I should do next. Any and all help is appreciated.