How to Increase Calcium in Aquarium

The first thing you need to know before adding calcium to your aquarium is the current calcium level. If this number is low, it may be necessary to increase the amount of calcium in an aquarium. 

For those who are not sure how much they should add, a few factors should be considered. These include the size of the tank and the kind of fish being kept within it. Those with larger tanks or more delicate species would typically need less than smaller or hardier species.

How to Increase Calcium in Aquarium

The best way to determine the right amount of calcium you need is by visiting a local fish store. But, if there is no one near you, then your next best option may be to use an online calculator. So, this article is for you. You will learn how to increase calcium in aquariums with just one simple trick!

10 Steps to Follow on How to Increase Calcium in Aquarium

Step One: Buy Scraping Tools

Before you can do anything, you need to scrape the calcium deposits off your glass. You don’t want it building up or getting too much in the water column. You can use any scraper to do this. There are also magnet cleaners that work well, but many of them use pressurized water, which can disturb your aquarium’s eco-balance.

Buy Scraping Tools

Then you can follow up by using an algae scraper to remove the green stuff from the walls of your tank. These are often sold in packs at pet stores where you get the algae scraper, a plastic tube to catch the gunk, and some premoistened swabs to clean it out with.

Step Two: Put Your Heater on a Timer

This is one of the easiest ways to increase calcium in aquariums. Turn your heater on for about 12 hours every day. The timer allows you to set it and forget it, and since the heater is on a lot, it helps boost the calcium levels in your tank. Of course, the best way to do this is to ensure that your heater will only turn on when you need it.

This means you don’t have to worry about electricity costs, and it makes it easier for people who are out of the house during the day. This also means that you have to keep an eye on your tank while you’re gone, but it’s worth it to have a healthy aquarium. If you have a massive aquarium, then less time will be needed for this step.

Step Three: Don’t Take Any Water Out

One of the most important parts of how to increase calcium in aquariums is not to take any water out of the tank. This makes it harder for your aquatic life and can cause many problems, so if you want healthy fish and corals, you need to leave the water right where it is.

Just keep an eye on your ammonia levels and make sure to test the water every day. If your ammonia levels are over 0.25ppm and your calcium and alkalinity levels stay high, then you might want to feed your fish less or give them a swim bladder treatment.

Step Four: Keep Your Filter Running

You don’t need to turn off the filter to do this step; you just have to ensure it’s always running. To increase calcium in aquariums, you need to keep the bacteria working as well as possible. That means making it harder for them to break down the greasy sludge that builds up over time.

Keep Your Aquarium Filter Running

This is especially important if you have a protein skimmer or a refugium on your tank because both use up lots of oxygen. The refugium needs a bit of light to keep the algae growing, while the skimmer needs lots of oxygen to get into the water. Either way, you always need proper filtration and circulation to increase calcium in aquariums.

Step Five: Use a Calcium Reactor

You can buy a calcium reactor, or you can make one yourself. It’s a big container that holds calcium carbonate and turns it into liquid calcium for your tank, which is what you’ll need to do if you want to increase calcium in aquariums. The liquid calcium will then react with the water and push up both calcium and alkalinity levels.

If you’re planning on increasing calcium in aquariums, you should also think about regular water changes. You can change up the amount of saltwater and freshwater that you use, but make sure to try and keep it on a regular schedule. These steps should help you in learning how to increase calcium in aquariums.

Step Six: Use Calcium Carbonate and Corals

This is a straightforward way to increase calcium in aquariums, and it means that you won’t need to use as much saltwater when you do your weekly water changes. If you have lots of rocks and corals in your tank, this might be the best way to increase calcium in aquariums.

You just have to scoop up a bunch of coral skeletons or rocks from the bottom of your tank and throw them into your water container. These corals and rocks will release lots of calcium carbonate, which makes up limestone and seashells.

Step Seven: Make Sure Your Water is Warm

To increase calcium in aquariums, you need to remember that it does better when warmer temperatures. If your water is too cold, it won’t dissolve properly and can even cause problems with pH levels. This means that it’s essential to keep your water at a warm and steady temperature.

It’s not always easy to keep the temperature just right, but that’s why you have a heater in your tank. If you’re having problems with ammonia, you should also look into getting an ammonia detoxifier and a protein skimmer. If you want to find out more about how to increase calcium in aquariums, keep reading.

Step Eight: Use a Calcium Reactor to Increase Your Levels

There are many benefits that come with keeping calcium and alkalinity levels high, but you should start by looking into ways to increase calcium in aquariums. It might not seem like much at first, but it can lead to bad things if those levels get too low.

You Can Use a Calcium Reactor

The best way to increase calcium in aquariums is by using a calcium reactor, but you can also try to do this by using lots of corals and rocks. It might take some time, but once the levels get high enough, then your fish should start noticing an improvement.

Step Nine: Get More Alkalinity into Your Tank

This is another significant step, and it will help you to increase calcium in aquariums. The more alkalinity you have, the better off your fish will be, and it will help them feel much more comfortable in the water. This is because higher levels of alkalinity make for a less acidic environment.

The best way to get this done is by using a calcium reactor, but you can also give your fish food high in calcium carbonate. This might not be the best solution since it’s costly, but it’s worth a shot if you’re having problems with alkalinity.

Step Ten: Do Weekly Water Changes

Most people recommend that you do water changes weekly, but if you want to increase calcium in aquariums, you should consider doing them even more often than this. Once your levels are high enough, you can probably do them every two weeks, but the important thing is always to do them on a regular schedule.

Do Weekly Water Changes

The best way to increase calcium in aquariums and alkalinity is by doing water changes, so you need to set aside some time each week for this. You can try to use rock or coral skeletons if you want, but make sure to rinse them before throwing them into the container.

It’s important to remember that it will take some time for your calcium carbonate levels to go up enough, but as soon as they do, then you’ll see a significant improvement in your fish. If you keep trying these methods consistently, you should be able to increase calcium in aquariums within a few weeks.

Frequently Asked Question

How Much Calcium Do I Add to My Aquarium?

It is always recommended to use calcium and other supplements in your aquarium as a preventative measure. However, you should never use an excess of calcium, which can lead to the buildup of sludge or algae that can be harmful to your fish.

If you have a saltwater aquarium, it is advised to add 1 teaspoon of CaCO3 per gallon of water. If you have a freshwater aquarium, then add 2 teaspoons per gallon.

Do Aquarium Plants Need Calcium?

Aquarium plants do not need calcium to grow. Aquarium plants can be planted in either soil or gravel. Some aquarium plants require more nutrients than others, but all of them need light and CO2 to grow.

How Much Epsom Salt Do I Add to My Aquarium?

Adding Epsom salt to your aquarium is a great way to improve the water quality and provide relief for your fish. How much you should add depends on the size of your tank, but generally, it is about 1/4 tsp per gallon of water.

Should I Add Salt to Freshwater Aquarium?

The general rule of thumb is that you should add salt to freshwater aquariums if the pH level falls below 7.0.

However, there are exceptions to this rule. For example, adding salt can be beneficial for certain types of fish like African cichlids and discus fish that thrive in high-salinity water because they need it to survive.

It is also a good idea to use salt when your tank has been completely depleted of all its natural minerals from decomposing plants and animals. You should not add any more than 3/4 teaspoon per gallon of fresh water every day, though, because too much salt can cause health problems in your fish, especially as they grow larger.


In conclusion, the best way to increase calcium in an aquarium is by adding more water changes. Aquarium owners should take care not to overfeed fish and other aquatic life. Furthermore, they should purchase a calcium reactor or increase the levels of corals and rocks to improve alkalinity.

All of these methods will help you maintain sufficient calcium and alkalinity readings for healthy fish living conditions. Following all of these steps can make a huge difference when it comes to the health of your fish and whether or not they live a long and healthy life.

The critical thing to remember is that you need to keep your pH levels high to ensure that your fish are living in the right conditions. Most people know to do this, but they don’t know that the same rules apply to calcium and alkalinity. This blog post has given helpful advice on how to increase calcium in aquariums.

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