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How Many Drops of Water Conditioner Per Gallon

A water conditioner is an essential part of keeping your fish alive and healthy in a fish tank. The water conditioner removes chlorine, chloramine, rust, hydrogen sulfide and other unwanted contaminants from the water so that you will have healthy fish in your tank.

To make sure that you are using the right amount of water conditioner to keep your fish alive and well, it’s important to know how many drops of water conditioner to add per gallon of water. Before discussing it, we first look at why a water conditioner is important for a fish aquarium.


Why water conditioner is important?

Water is as important to our health as it is to our aquariums. For fish tanks to be healthy and full of life, they need good clean water. This means that you need to monitor your tank's pH levels, and clarity, and make sure that it doesn't contain any harmful chemicals. In short, it helps us in improving the quality of water.

Luckily for us, we don’t have to do all of these things alone. We can use professional products like water conditioners to help keep our tanks balanced and full of life.

Adding tap water to an aquarium without treating it first can cause harm to your fish's sensitive immune systems. Water conditioners help dechlorinate tap water while adding minerals back into your fish's environment, which they require for proper health.


How many drops of water conditioner per gallon?

There is no hard and fast rule for how much water conditioner to use. But if you look at almost any label, you’ll see that it provides recommended dilution rates for different size aquariums. As 1 ml is equal to 20 drops.

So, the experts usually recommend a 0.5 ml ( 10 drops)water conditioner for a one-gallon fish tank. If your aquarium is 5 gallons, you would need 50 drops(2.5 ml). If it's 20 gallons, 200 drops will be required. You can also adjust the quantity of water conditioner based on how well your fish are responding to their new environment.


Which water conditioners to use?

There are three different kinds of aquarium water conditioners.

  1. One is to remove chlorine and chloramine. Chlorine is added to public water supplies to disinfect it, while chloramine is used as an alternative since it's long-lasting. If you have chloramine in your water supply, you will need to use a chlorine-neutralizer if you want to keep your fish healthy.
  2. Another type of water conditioner removes heavy metals from tap water. Heavy metals like copper, zinc, and lead can be harmful to fish if they get into their environment in high concentrations.
  3. The third type of water conditioner adds minerals back into tap water that has been treated with either chlorine or chloramine. This helps restore some of what was lost when those chemicals were added to kill bacteria. You should always test your water before adding any kind of conditioner to make sure there isn't anything else in it that might harm your fish.


What are the disadvantages of overusing water conditioner drops in a fish tank?

Overusing water conditioner drops may pose more harm than good to your fish tank. Here are some disadvantages of overusing water conditioners in your fish tank.


Effect on aquarium water

By administering more drops than necessary to a fish tank, you could be causing your aquarium to become too soft and detrimental to your fish's health. Water that is too soft or acidic can cause many problems including nitrite spikes, dissolved oxygen loss, disease outbreaks and even death.


Overgrowth of algae

Water conditioners help to control algae by killing algae spores. What many people don't realize is that these same additives also slow down or stop the growth of new algae and other microorganisms.

Thus, if you use too much water conditioner, you can end up with too few algae spores to maintain your levels of plant-eating nitrifying bacteria. Not only will you have more algae but also more ammonia, which is toxic to aquarium life if not kept under control by nitrifying bacteria.


Injure fish

It's easy to overlook important things when you're tending to your aquarium and getting it up and running. One thing that many people don't think about, though, is how adding too much water conditioner can injure your fish.

Too much chloramine can cause damage to their gills, which will lead to diseases and leave them unable to survive in their environment. Therefore, it's always best to follow any instructions on how many of certain products you should use.

In addition, if you notice your fish gasping for air or swimming erratically after adding a product to your tank, it could be because they've been exposed to too much of something. In these cases, it's best to remove them from their current environment and give them time to recover before returning them to their tank.


The best way to use them

  • Experts recommend taking any supplement, including fish-tank water conditioners, in moderation. The easiest way to achieve that is to use them sparingly as directed by their manufacturer.
  • In addition, consider consulting with your veterinarian or a professional aquarist if you’re not sure whether your pet needs them at all.
  • Ultimately, paying attention to exactly how and when you use your fish-tank water conditioners can help keep your family pets happy and healthy for years to come.



A water conditioner is a necessary part of an aquarium as it removes the harmful contaminants from the fish aquarium. It is very helpful in building a healthy environment for fish. But its overuse can kill your fish.

Therefore, you should know how many water conditioner drops are required for a one-gallon fish tank. In this fish care guide, it is also explained the required quantity of water conditioner drops for more than a one-gallon aquarium. By adopting the explained quantity, you can make a healthy and safe aquarium for your fish.



1. Is a water conditioner safe for the fish?

Yes, a water conditioner is a safe and reliable thing for the fish. It only can become harmful in the case of over-usage.

2. What are the parameters of aquarium water?

The water parameters are temperature, pH level, dissolved oxygen, color, taste, etc.

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