How Big Do Angelfish Get?

How Big Do Angelfish Get? Angelfish are a popular choice for aquariums, due in part to their beautiful colors and patterns. However, they can be challenging fish to keep because of the need for clean, well-oxygenated water. They are not reef safe and can make food aggressive. But if you have the time and resources to provide them with what they need, these fish will reward you with many years of beauty and grace within your tank.

How Big Do Angelfish Get?

There is a lot of variation in the size of angelfish due to many factors like gender, genetics, and environment. Male angelfish are generally larger than females. In general, wild angels are larger fish than tank-bred ones because they grow slower with less competition.

Some angel species will get as large as 12 inches (30 cm) towards adulthood while others have been known to exceed 16 inches (40 cm). The average adult range is between 6 and 8 inches (15 – 20 cm). Even juveniles can be over an inch long!

How Big Do Angelfish Get

What Size Tank Do Angelfish Need?

Most angelfish are sold at around 3-4 inches (8 – 10 cm) as juveniles and require at least 30 gallons (114 liters) of water. They can add a lot to the bioload in a tank which will need regular water changes to keep clean. Juveniles are very sensitive to nitrate buildup and can die suddenly even with normal water conditions, so take extra care when setting up their environment.

Common Angelfish Tank Size:

Since there are many species of angelfish, it’s best to check the specific needs of the type you have. Some common tank sizes include:

· 30 gallon (114 liters) for a 1” – 2” (2.5 – 5 cm) angel

· 55 gallon (208 liters) when they are 3-4” long (.75 – 1 meter)

Altums Angelfish Tank Size:

Altum angels require a longer tank and can be as large as 12 inches long as adults. A 90 gallon tank starts to feel very crowded at this point. It is best to upgrade your tank if possible because these fish will need more territory than smaller and will not be as active when cramped for space.

Leopold’s Angelfish Tank Size:

Leopold’s are notoriously aggressive and territorial, especially the males. Even a 1 inch (2 cm) angel will feel threatened in a 30 gallon tank and may fight with its siblings or eat any small fish that it can catch to make itself feel better. A 55 – 90 gallon (208 – 368 liters) tank is best with at least one male being kept alone unless there are several females per male pair, but there is still risk of injury from aggression during disputes over territory and mating rights.

If you have multiple angels, they should all be added to your community tank the same time when they are 3-4 inches (8 – 10 cm) in length. The risk of injury and death caused by territoriality is much lower when they are all adults, but it’s still important to keep a close watch on the interactions between angelfish pairs just in case.

How Can I Help My Angelfish Get Big?

There are a lot of factors that go into getting your angelfish big and healthy, but one thing you can do right away is provide them with a larger tank. It will help immensely with keeping their water clean and allow them more room to grow larger without feeling cramped or insecure.

Even if you do have a large tank, it is best to add several hiding places for them to retreat to if they feel threatened or do not want to be seen. Driftwood will help with this and provide them a place to breed since most angelfish like to have their territories above nests in the substrate.

Another thing you can do is add more food sources that are lower on the food chain than your angelfish. This helps decrease aggression between angels by giving them additional prey items without making things difficult for your other tank inhabitants. There are many livebearers, catfish, mollies, bristle-nosed plecos, and snails that can serve as cleaner crew while providing additional proteins for growing angel fish. Angelfish rely heavily on sponges for clean up of other fish wastes which means there is more bacteria in the water for filtration and waste processing.

Plant growth will also be accelerated if you have angelfish because they excrete excess nitrates through their gills which means faster growth of algae, so it’s best to select plants that are not sensitive to higher nutrients such as Java fern and Anubias nana. If you do have other delicate plants, like crypts, which are easily killed by high nutrient levels, then angelfish should be fed twice a day instead of once per day to reduce their activity around your tank which reduces the amount of waste being processed into nitrates.

Angelfish can also benefit from having very clean water with minimal organic buildup in order to keep them healthy. A good canister filter with highly oxygenated water is best for this purpose and will reduce the need to do frequent water changes because it will keep your nitrates low. However, you should still perform a 20-25% water change every 1 – 2 weeks on the tank to maintain good bacteria levels as well as remove any excess organic buildup from feeding too much of protein foods like bloodworms or shrimp pellets.


The main things that will help angelfish stay healthy are:

· Keeping them in at least a 55 gallon (208 liter) tank

· Adding hiding places such as driftwood in order to provide security

· Providing more food sources so they don’t become aggressive over limited prey

· Maintaining clean water with minimal organic buildup to keep nitrates low

If you do this, then your angelfish will grow big and healthy just like the ones in pet stores.

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