Our ecosystem has changed over time because when we started the tank was fairly dirty, and the rocks on the bottom needed to be cleaned, and the water was a little cloudy. After we conducted a partial water change, cleaned the sides of the tank with a sponge, and siphoned the rocks, the water quality was better. In four days, after one of our fish died, the nitrate level rose from 5 ppm to 160 ppm, so we had to do another partial water change which fixed that problem quickly. Our nitrate rose and fell, but never again went to an uncontrollable unhealthy level for the fish. The ammonia did rise to a bad level at one point, but we added some pondzyme and it went back down to 0 ppm. Our plants stayed the same throughout the time we had the aquarium, and the baby mollies grew throughout.
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