I started a community Aquarium last thursday(20th). I put 3 red wag platys in it with rinsed gravel and fake plants. I read that I should do partial water changes when ammonia gets above 0, but at the same time I understand that I need ammonia to build nitite in order to build nitrate. So my question is...should I let ammonia accumulate so nitite can knock it down or should I do the water changes?