The aquarium reading room
The why behind
the numbers.
The calculators tell you how much. These guides help you understand why, what a reading means, and what to do next.
Find your next read13 practical guides Freshwater, planted & reef
The nitrogen cycle explained
Ammonia → nitrite → nitrate, why it takes weeks, and how to know when it is done.
Read the guide01 / Freshwater
Freshwater: A little understanding. A healthier tank.
From the first cycle to the weekly routine, get to know what is happening in your water.
Start with the essentials
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The nitrogen cycle explained
Ammonia → nitrite → nitrate, why it takes weeks, and how to know when it is done. -
Fishless cycling, step by step
Dose ammonia, test, wait, repeat — with the numbers that say you are finished. -
Freshwater parameters chart
Every target range on one printable page: pH, GH, KH, ammonia, nitrite, nitrate, temp.
02 / Planted
Planted: Make sense of what your plants need.
Understand the thinking behind fertilizer dosing before you reach for the bottle.
03 / Reef & saltwater
Reef & saltwater: Small parameters. A bigger picture.
Get familiar with the numbers behind a reef, from source water to coral chemistry.
04 / Setup & care
Setup & care: Start well. Keep it going.
Plan the tank’s placement, then build a routine that fits the water and equipment you keep.
05 / Troubleshooting
Troubleshooting: Something looking off?
Start with what you can see. Identify the problem, then work out what to change.