Your tank water can look spotless and still be slowly harming your fish. Clarity tells you what your eyes can see. Water parameters tell you what your fish actually live in. As we covered in the Nitrogen Cycle series, clear water is not the same as safe water.
This is Part 1 of our 4-part Water Parameter Series. By the end of it, you will know which numbers to track, what they should read, and how to build a simple routine around them. We start with the big picture.
What Are Water Parameters?
Water parameters are the measurable properties of your aquarium water: temperature, acidity (pH), mineral content (GH and KH), and the waste compounds produced by fish and bacteria (ammonia, nitrite and nitrate). Think of them as the vital signs of your tank. Fish cannot tell you something is wrong. The numbers can, often days before the fish show symptoms.
The 7 Numbers Every Aquarist Should Know
|
Parameter |
Target for most tropical community tanks |
Warning sign |
|---|---|---|
|
Temperature |
24 to 28 C |
Swings of more than 2 C in a day |
|
pH |
6.5 to 7.5 (goldfish and livebearers like 7.0 to 8.0) |
Sudden shifts of more than 0.5 in a day |
|
GH (general hardness) |
4 to 12 dGH |
Far outside what your fish species needs |
|
KH (carbonate hardness) |
3 to 8 dKH |
Below 2 dKH, where pH can crash |
|
Ammonia |
0 ppm |
Any reading above 0 |
|
Nitrite |
0 ppm |
Any reading above 0 |
|
Nitrate |
Below 40 ppm (below 20 ppm for sensitive fish and shrimp) |
Steady climb between water changes |
Stability Beats Perfection
Fish adapt to a range of conditions. What they cannot handle is a sudden swing. A tank holding steady at pH 7.8 is safer than a tank where someone chases pH 7.0 with chemicals every other day. If a number is off, correct it gradually, over days rather than hours.
Why Indian Aquariums Need Extra Attention
- Tap water varies by city. Mumbai's supply is typically very soft, while many northern and western cities have noticeably harder water. The same fish can need very different care depending on where you live.
- Chlorine and chloramine are in the supply. Every drop that enters your tank must be treated first. Sunken Garden Anti-Chlorine neutralises both and binds heavy metals.
- Temperature swings are real. Hot summers and cool winter nights both stress fish. Read our guide on what temperature your aquarium should be.
- Municipal water can shift during monsoon and after pipeline work, so one test a year is not enough.
- Power cuts stop filters. When the filter stops, beneficial bacteria start to die, and ammonia can climb.
Your First Step: A 5-Minute Baseline Test
- Collect a glass of untreated tap water and test it. This is what you start with.
- Treat a second sample with water conditioner and test it again.
- Test your tank water.
- Write all three results in a notebook or your phone.
- Compare. The gap between tap water and tank water shows what your tank is adding or removing.
What's Next in the Series
In Part 2, we look at pH, the number everyone argues about. Part 3 covers GH, KH and TDS. Part 4 shows you how to test properly and what to do with every result.
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Questions about your water results? Write to us at info@mayurdevaquascaper.com
