Mossy Madness! Our DIY Guide to the Ultimate Marimo Aquarium

It’s February, and, for a lot of us, there isn’t much green to go around. While we still have to wait a few more months for vibrant greens outside to bloom, we have a solution for your mid-winter viridescent cravings.

Last year, around this time, we taught you about DIY terrariums. This year we have something even more unique in store. Marimo moss balls have a cultural significance in countries in the Northern Hemisphere, most notably in Scotland, Iceland, Estonia and Japan. The term “marimo” originates from Japan, combining the prefix “mari” (meaning “ball”) and the suffix “mo” (meaning “water plant”) to give you, quite literally, “water plant ball.”

While this water plant ball is often referred to as a moss ball, it is actually made of algae and grows naturally in ponds and lakes in many northern countries. The balls are now domesticated for consumer use, and they are a great way to fight off winter blues and brighten up your home.

Here is a step-by-step guide to help you set up your own marimo aquarium:

What you’ll need:

  • Clear bowl or container of any size
  • Water
  • Pebbles, rocks, sea glass or decorative items of your choosing
  • Additional aquarium decorations (optional)
  • Marimo (which you can buy on Amazon, Ebay or from individual merchants)

What to do:

  1. Clean your bowl and container and place it on your work area.
  2. Take your choice of assorted gravel and spread evenly on the bottom of the container.
  3. Place your marimo into the container and fill with cool (70 degrees Fahrenheit or lower) water.
  4. Add your decorations, and voilà—your marimo aquarium is complete!

Tips to keep your marimo healthy:

  • If you use tap water to fill up your marimo’s tank, be careful of the chlorine content, as a high level of chlorine could make your marimo sick.
  • Marimo aren’t used to sunlight, so keep them away from the window to avoid burning them.
  • Marimo need their water to be changed every few weeks, so be sure to give them the fresh water they need.

Remember to have fun with your marimo! You can put them in containers of all sizes, from jars that are the size of a necklace, like the above photo, to the size of a standard goldfish bowl. It’s up to you to personalize your marimo’s home.

Let us know how your aquarium turns out! Tag us on Facebook or Twitter with pictures of your very own DIY marimo habitat. 

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