First let me tell you my tank was set up this past Friday and I used uncured aquacultured rock. My question is: when I tested the water 2 days ago the ammonia was 1.5, when I tested it yesterday it was 0.05. After the test I cleaned off some whitish looking little sheets that had appeared overnight. When I tested the ammonia today it was back up to 1.5. maybe I just released some dead stuff into the water when I cleaned off the rock? Should I be concerned, or do you think the ammonia will go down again tomorrow?