I just bought my first ten gallon tank a little over a month ago and have one goldfish in it. I know that they can be quite messy, so I have a power filter and sponge filter in the tank as well. I was noticing that the ammonia levels have been getting between 0.5-1 ppm so I was doing 20% water changes every other day and adding API AmmoLock, and it seemed to work. A few days ago I noticed another rise in ammonia so I did a water change and added my AmmoLock last night. I woke up this morning to a white cloudy tank and ammonia levels at 8.0ppm?????? My goldfish seems just fine. I just did a 50% water change and water still is a little cloudy.