How To Build Your Own Mason Jar Aquaponics System

Over the past decade, interest in aquaponic gardening has become popular as more people seek a sustainable way to grow their food. For those looking to learn more, mason jar aquaponics is one of the easiest ways to start learning about the system and growing your food.

How To Build Your Own Mason Jar Aquaponics system

Interested In Mason Jar Aquaponics? Read This First

In a traditional mason jar aquaponics system, you’ll typically use a standard mason jar, a betta fish and a plant pot in the top containing your grow medium and crop. A classic mason jar is far too small for fish.

A single betta fish needs a 2.5-gallon tank at the very minimum, which means a standard mason jar is far too small. Don’t let this put you off, however.

Several more enormous alternatives on Amazon are just as decorative and better suited for keeping a betta fish.

Here are a couple of our favourites:

Getting Started

In this section, we’re going to look at how to choose:

  • A container
  • The best fish for your setup
  • The best crop
  • Extras to improve your setup

The Container

Okay, first things first, let’s take a look a how to choose the suitable mason jar or, rather container, for your aquaponics setup. There are two rules of thumb when selecting a container.

Size (volume)

If you plan to stock a fish such as a betta, you must find a jar that can hold at least 2 to 2.5 gallons / 7.5 to 11 litres. Not only is this kinder for your fish, but it will also allow you to harvest more from your crop.

Size (space)

The second rule of thumb to keep in mind is that your fish should be able to comfortably turn around and swim.

While jars are a popular choice, we’ve heard of people successfully creating systems using large vases. That said, you want to avoid anything with a thin middle section.


The final consideration is that the opening at the top of the container should be wide enough for a plant pot.This is why jars are a popular choice as the opening is more than capable of holding a plant pot.

Choose Your Fish

When it comes to choosing fish for your setup there are a number of popular options that come with various pros and cons.We’ll take a look at some of the popular choices now.

Betta Fish

Betta fish are among the most accessible creatures to keep in your jar-based aquaponics system. They don’t require a filter, can be kept in a relatively small tank (2 gallons / 7.5 litres) and the males are beautiful to look at.

While they don’t require a filter, they need the water to be full of oxygen, so you’ll need to change the water each week and put an actual plant into the tank. You’re also limited to just one fish per setup unless you use a large tank.

Ghost Shrimp

While it can be tricky to initially introduce ghost shrimp to your setup, once they are established, they are a fantastic aquaponic fish to keep.

Ghost Shrimp require relatively little attention, and don’t unlike other shrimp species; they don’t overbreed. The table below briefly summarises how many shrimp can be kept based on different jar sizes.

Container Size# Shrimp
1 Gallon / 4.5 litres8
1.5 Gallons / 6.8 litres12
2 Gallons / 7.5 litres16

Assassin Snails

Unlike regular aquarium snails, which are loved by some fish owners and hated by many given their ability to reproduce quickly and uncontrollably, Assassin snails are an excellent option for aquaponic gardeners.

Unlike most breeds, Assassin snails have two distinct sexes, which means you can keep groups of males or females, preventing overbreeding. The table below is handy for knowing how many to the stock is based on your jar size.

Container Size# Snails
1 Gallon / 4.5 litres2
1.5 Gallons / 6.8 litres4
2 Gallons / 7.5 litres6


Endlers are a great choice to keep your mason jar aquaponic system stocked. The secret here is to only keep one gender per setup.

Container Size# Fish
1 Gallon / 4.5 litres3
1.5 Gallons / 6.8 litres4
2 Gallons / 7.5 litres6

A Note on Goldfish

While Goldfish are an excellent choice for larger setups, they are far too large for a small jar system and should never be used.


Now for the fun part – picking what you’re going to grow! Almost anything can be grown in aquaponics, but herbs and leafy greens always grow well. For the best results, you must start the plant in soil and then transport the seedling to your aquaponics system.

The Final Pieces

We nearly have everything in place to create your mason jar aquaponics setup. However, there are a few final considerations that you’ll need to make.

Plant Pot

The only absolute requirement is that the pot you pick should fit inside the jar you use for a container.

Growth Media

The growth media is what your plant sits on, and the roots grow around. It’s also the material that lines the bottom of the tank and is used to help bacteria grow. Gravel and shale are solid choices.

A Plant

The last piece of the puzzle is to add a plant inside your container. Not only will the plant help oxygenate the water, but it’ll also provide your fish with entertainment. Popular choices include Hornwort, java fern, sword plans and Anubis. The only other things you’ll need are fish food and some water testing strips.

Build Your Mason Jar Aquaponics System

You’ve gathered all the parts, so now it’s time for the fun part – pulling it together!

Step 1: Let your water sit

Okay, so this step is pretty dull – add water to your jar and let it sit for 24 hours.

Step 2: Add Gravel

Once the water has been allowed to sit, add 1 inch of your chosen grow media to the bottom of the jar.

If you plan on adding a plant to the container, now is the time to do so.

Next, add the grow media to the bottom of your plant pot and place the plant.

Step 3: Introduce Your Fish

Next, introduce your fish to the jar.

Step 4: Place the plant pot into the jar

Finally, put the plant pot into the jar opening. It’s important to note that your plant pot should have a hole in the bottom to allow the roots to access water and to allow air to circulate into the water.

The Bottom Line

So there you have it, using the handy guide above, you’re ready to create your mason jar aquaponics system.

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