Optimal water quality for Aquascape Tank

In this article, we will explain about “Optimal water quality for Aquascape Tank”.

Water quality is invisible, but it is very important for growing aquatic plants.

If you can manipulate the water quality freely, you will be able to do this.

  • Can grow most aquatic plants
  • Less algae problems

To make it easy for anyone to understand, we will make explanations as simple and easy to understand as possible.

This is a content for beginners to know, so please read it.


“Water quality control” is one of the barriers for beginners. If you can clear this, you can maintain the Aquascape much more easily!

The Optimal water quality

pH 5.5 ~ 6.5

This is the optimal water quality for Aquascape tanks.

For the time being, don’t worry about anything else, let’s keep the pH within this value.

We won’t go into the details in this article, but we can use “CO2 and fertilizer” efficiently if we are within this value.

“PH 5.5 ~ 6.5” Within this range, most aquatic plants can be nurtured beautifully!

*Since it is a guideline, you do not have to strictly observe it!

For different water quality

When pH is lower than 5.5

Some aquatic plants do not grow, but there are few harmful effects.

Much better than a high pH.

When pH is higher than 6.5

CO2 and fertilizer absorption efficiency decreases.

In particular, CO2 is fatal. If the pH is higher than 7.0, most of the added CO2 will not be used for aquatic plants.


People who say that they add CO2 but can’t grow aquatic plants often have pH problems.

To create optimal water quality

To be honest, the tap water in Japan is so good that we can make a beautiful aquatic aquarium without adjusting the water quality.

But you don’t always have good tap water.

Most people need to lower the pH.

How to lower pH

  1. Use the soil
  2. Use pH lowering agent
  3. Reduce water exchange

Use the soil

Soil is the easiest way to lower the pH.

Anyone can easily make water quality suitable for aquatic plants by using soil.

However, please be aware that the soil’s ability to adjust water quality does not last forever!

Although it varies depending on the soil, it will expire in about 1 to 3 months.

If you’re feeling worse than the first time, the pH may be the cause.

In such a case, measure the pH and check it.

The effect may be lost in a shorter period of time under conditions such as “using a large amount of stone” or “changing water frequently”.

Use pH lowering agent

tetra ph/kh minus
Measure pH

Check the tank pH using reagents and pH meter

Add pH lowering agent

Adjust by adding a pH-lowering agent such as “Tetra PH \ KH Minus”.

It is OK if the pH is set to 5.5 ~ 6.5.

After 1 day, measure the pH again

It is OK if the pH is 5.5 ~ 6.5.

If the pH seems to rise, turn it on again to adjust.


Check the pH regularly and adjust it to pH 5.5-6.5.

It is recommended to add a pH lowering agent when changing water.

This is the procedure when using a pH lowering agent.

The recommended pH lowering agent is “Tetra PH\KH Minus”. If you want to maintain an aquatic aquarium, you should have one.

Depending on the environment, PH \ KH Minus components may be adsorbed and combined to be invalidated. In that case, let’s deal with “increase the amount of addition” “increase the frequency of addition”.

This is especially likely in environments where soil is used.

Reduce water exchange

If you do nothing, the pH will down naturally.

Especially when using a soil, it has the power to lower the pH, so it will go down.

Therefore, it is possible to lower the pH slowly by refraining from changing water.

When the water is changed, the water quality approaches “tap water”. While the soil’s ability to adjust water quality is alive, it will be harmful if it is lost.

Water change is the best way to maintain aquatic plants aquariums, but there are also disadvantages.

There are many good effects such as removing algae and adding minerals, so it may be difficult to refrain.

However, it is also good to remember that you may be out of tune due to “too much water change”.


Now, I can maintain the Aquascape tank with little water change. I’m striving to someday be able to systematize and communicate “management with less water change” to somebody!

The Summary

pH 5.5~6.5

This is the optimal water quality for Aquascape tanks.

Just remember this!

When water quality can be freely controlled, almost aquatic plants can be brought up beautifully. There is no algae trouble, you will never have to worry about frequent maintenance!