How To Lower Ph In Aquarium Top Guide 2021

What’s pH?

PH is a type of dimension for both acidity and alkalinity. The pH scale ranges from 0 to 14, with 0 being very acidic, 7 being neutral, and 14 being quite plump.

Vinegar is a well-known acid with a pH of 3, also bleach well known alkali using a pH of 12. Most tropical fish live in waters with a pH between 8 and 6, even though there are a few notable exceptions. Chocolate gourami, reside obviously in a pH as low as 4, and Soda cichlids, a pH as large as 10!

Discus are well-known low pH fans, whereas Malawi cichlids enjoy it large, and lots of aquarium owners either increase or lower the pH in their own water to better match their fish.

What’s aquarium pH important?

Our fish have evolved and adapted over millions of years to accommodate particular kinds of freshwater. Give them water with a pH that’s the same as in their own natural habitat and they’ll show superior colors, be in a position to display more natural behavior, and strain.

Maintain a very low pH fish at large pH (or vice versa) and at best, it will not be joyful, but at worst it might perish, because its body’s physiology isn’t adapted to work in these adverse water conditions.

The pH scale is logarithmic, meaning that a pH of 6 is ten times more acidic than pH 7 and 100 times more acidic than pH 8. That is a major difference for an aquarium fish, therefore it is very important that we keep the ideal species in the ideal pH.

The Way to reduce aquarium pH

There are numerous techniques you may reduce the pH on your aquarium. The first method is to purify the water in its source. UK tapwater might be either low pH, impartial, or higher pH. If it is neutral or high and you wish to deliver that pH down, then the very best method is to filter it with Reverse Osmosis, or RO.

RO, is a process where tap water has been passed through a sediment filter, then through a carbon filter, then eventually through a nice RO membrane, which really strips the minerals in the water that were causing it to have a top pH.

There are different advantages to RO also, as it also removes chlorine, nitrates and phosphates, not one of that you need from the normal aquarium. Reverse Osmosis units are available that can be attached to your tap and a drain in your home, and the hobbyist could produce their own demineralised, dechlorinated, low pH water. Fantastic for all fish.

RO can be filtered through a fourth filter, a deionizer, which removes even more impurities such as silicates and the result being water that’s quite pure. If your tap water has a higher pH and you desire a permanent supply of low pH water, RO is your ideal solution long term.

Additional Procedures

The fastest way to reduce pH in the aquarium would be to use a product known as pH Down. Increase the tank as directed and the carbonate hardness from the water is neutralised, and the pH goes down.

PH Down is the most successful when utilized in water using a neutral pH, as the higher the pH, the greater carbonate hardness which water will probably have, and also something known as loading occurs. High carbonate hardness maintains a high pH, or pH can fall and then rise again, because of buffering.

Test your water

The pH of water can’t be guessed by looking at it, as both alkaline and acid water may be completely colourless. A pH test kit is essential to check pH, particularly in the event that you would like to reduce it, as plain water with a pH that is too low may be harmful, even for non pH enjoying fish.

As volcano water drops below pH 6 it may be exposed to something called pH collapse. Here, pH drops immediately from six to four or under, shocking recently introduced fish, burning present inhabitants, and ruining the tank biological filter.

General hardness (GH) and carbonate hardness (KH) are related to pH, so if you truly wish to learn your water, check for pH, KH and GH, in addition to ammonia, nitrite, nitrate and phosphate.

JBL TestLab comprises all those evaluations and much more, and is an superb selection for the discerning fishkeeper.

Acid, alkaline, hard or soft?

Low pH contaminated water can be known as tender, and higher pH, alkaline water, tough. Hardness is a bit different to pH and rather indicates the KH and GH of their water, though pH, KH and GH generally go together, therefore acidic water is frequently known as soft, and alkaline water, challenging.


Even soft water fish love any nutrient content in their own water, also it helps to avoid pH crash, therefore remineralise RO water using Re-Mineral Tropic

Fish that favor a low pH



Cardinal tetras

Pearl gourami


Harlequin rasboras

Fish that favor a high pH




Sword tails

Lake Malawi cichlids

Lake Tanganyika cichlids

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