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. 1998 Jan;64(1):258–264. doi: 10.1128/aem.64.1.258-264.1998

FIG. 4.

FIG. 4

Ammonia (A), nitrite (B), and nitrate (C) chemistry for an aquarium from startup through 138 days. The saw-toothed pattern for ammonia is the result of the increasing frequency of dosing with ammonium chloride as nitrification was being established. The water was switched from freshwater to seawater on day 80.