Aquarium guides
The water chemistry behind a healthy tank: the nitrogen cycle, treating tap water, planning water changes and testing, from university extension and EPA sources.
GuideThe nitrogen cycleHow bacteria turn ammonia into nitrate, and how long it takes.GuideWater changesSize and frequency from your readings, plus a safe routine.GuideTreating tap waterChlorine vs chloramine and how to treat tap water.GuideTesting aquarium waterWhat to test, how often, and what readings mean.