Mason Jar Aquarium

mason jar aquarium pin image

Kids can create their own make-believe fish aquarium using a plastic mason jar. These darling mason jar aquariums make great bedroom decorations, and with the addition of submersible lights, make fun night lights too!

mermaid and seashell inside a jar with water and aquarium plant

Why this project is a hit

Less mess and maintenance than a real fish tank, these mini aquariums are fun to make and look awesome.

Kids can pick aquarium plants in their favorite colors and decide on fun fish or even a mermaid. The sky is the limit!

3 mason jar aquariums with plastic fish

Craft supplies you will need

You can make your aquariums with clear water, or add a few drops of blue food coloring for that deep blue ocean feel!

Also, I do suggest using plastic mason jars instead of glass, for safety reasons!

labeled supplies for mason jar aquariums

Get full list of supplies and directions in the printable version at the end of this post.

Helpful Project Information:

  • Age Level: 5 and up – smaller children may need help.
  • Mess Factor: Medium – water spillage
  • Level of Difficulty: Easy
  • Time to Complete: 30 minutes
  • Cost Estimate: Less than $6.50

How to Make a Mason Jar Aquarium

These step by step photos and instructions are here to help you visualize how to make this project. Please scroll down to simply print out the instructions!

  1. First, if you want your aquariums to be night lights, attach a submersible light to the inside of the jar lid using E6000 glue. Set aside to dry while you build your aquarium.

little boy adding plastic aquarium plant to a jar

  1. Place plastic aquarium plant into the jar.

little boy adding aquarium gravel to a jar with a spoon

  1. Use a spoon to add gravel around the bottom of the jar, covering the base of the plant.

little boy adding plastic fish to jaryoung girl adding a seashell to jar

  1. Place figurines, fish, seashells and any other items to the jar.

mermaid figurine with plastic plant and aquarium gravel in a glass jarlittle boy adding water to a mason jar with aquarium plants and plastic fish

  1. If you would like your water to be blue, add a couple drops of food coloring to the water first and stir. Slowly pour water into the jar.

little boy holding jar lid with a submersible LED light attachedyoung girl tightening jar lid

  1. Screw the lid in place.

three kids holding up their mason jar aquariums

To turn on the light, carefully remove the lid, turn on the light, and replace the lid.

mason jar aquarium night lights all lit up

Expert Tips & FAQs

  • You can trim the top off the plant with scissors if it’s too tall.
  • If you are just making aquariums and do not plan to use these as night lights, you can glue the lid on to deter young children from opening them up.

little boy holding mason jar aquarium he made

Kids will love making these adorable mason jar aquariums! Shopping for the creatures, plants and other additions is one of the best parts of this project!

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plastic jar with aquarium gravel, plastic fish, and plastic plant, in blue water

Print Project

5 from 1 vote

Mason Jar Aquarium

Create a fun miniature under-the-sea world to put on your bedroom shelf, display in the bathroom, or use as a night light!

Age Group: Kids Crafts

Project Type: Crafts

Supplies

  • 16- ounce plastic mason jar with lid
  • Filtered water tap water works, but may be cloudy
  • Plastic aquarium plants
  • Aquarium gravel
  • Plastic fish and/or figurines like mermaids
  • Seashells starfish, etc
  • Submersible candle lights optional, if you want these to be night lights
  • Blue food coloring optional

Craft tools

  • E6000 glue

  • Scissors

Instructions

  • First, if you want your aquariums to be night lights, attach light to the inside of the jar lid using E6000 glue. Set aside to dry while you build your aquarium.

  • Place plastic aquarium plant into the jar.

  • Use a spoon to add gravel around the bottom of the jar, covering the base of the plant.

  • Place figurines, fish, seashells and any other items to the jar.

  • If you would like your water to be blue, add a couple drops of food coloring to the water first and stir. Slowly pour water into the jar.

  • Screw the lid in place.

  • To turn on the light, carefully remove the lid, turn on the light, and replace the lid.

Notes

  • You can trim the top off the plant with scissors if it’s too tall.
  • If you are just making aquariums and do not plan to use these as night lights, you can glue the lid on to deter young children from opening them up.
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