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DIY Mini Aquarium – Activities for Kids

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While planning Chesney’s Underwater themed birthday party I was trying to find a fun DIY craft that fit the theme, didn’t cost a fortune, and doubled as a party favor.

I’m so sick of goodie bags filled with candy! I’d rather invest that money in something of actual value and make fun activities for kids. I’ve used affiliate links to the products I used.

Baby Marimos

While exploring different options on Etsy—I freaking love Etsy—I stumbled across these adorable little creatures called Marimos.

The owner of Wendiland, answered all of my questions and assured me that Marimos are extremely low maintenance and make great desk pets.

They simply need to have distilled water (changed once every 1-2 weeks,) no direct sunlight and a bit of movement.

Educational activities for kids - DIY Mini Aquarium Craft for kids with baby marimos

The Marimo is basically an algae ball. Taking good care of a Marimo is considered very good luck.

They can be found swishing around in Japanese fresh water lakes. They are extremely slow growing and the largest one on record is about the size of a soft ball and thought to be about 200 years old!

Fun Activities for kids – the DIY Mini Aquarium

Each of Chesney’s friends got to create their own DIY Mini Aquarium at her underwater themed party and take it home.

At first, their parents looked at me like I was crazy for sending their kids home with a new pet but once they realized it’s virtually self-sufficient and cost free, they loved the idea.

Activities for kids - DIY Mini Aquarium Craft for kids

This is what we used:

  • Small glass containers I went to a couple thrift stores and found some funky vintage glassware for under $1 a piece. (If you don’t mind spending a little more, you can get acrylic containers instead.)
  • Distilled water I grabbed a couple gallons and only used about half of one for this project.
  • Aquarium rocks I bought a couple different colors so the girls had options when decorating their mini aquariums.
  • Decorative glass stones Marbles, small mosaic glass pieces or any pretty and smooth glass will do. Just make sure it’s polished so no one gets hurt while handling it and boil it before adding to your Marimo’s home. Seashells are also an option. Whatever you use, just make sure you put it in boiling water first to disinfect.
  • Baby Marimos I found mine on Etsy, but if you aren’t interested in these, maybe artificial fish are more up your alley. (I don’t recommend live fish for containers this small.)

After cleaning all our supplies in boiling water, I set up the table and let the girls assemble their mini aquariums.

Simply let them pick their preferred colors and then layer the supplies in the glass container in the following order: aquarium rocks first, decorative glass stones or seashells next, then slowly pour the distilled water against the glass so it doesn’t disturb your rock arrangement.

Your mini aquarium is then ready for the baby Marimo!

Fun and education activities for kids - DIY Mini Aquarium

Make sure the kids know that this is actually a living thing and deserves care and respect just like any other pet.

We even named all our Marimos!

All they need is a nice place in your home or on your desk away from direct sunlight.

Don’t forget to change their water once every couple weeks, or if you notice it getting cloudy, using only distilled water.

And, every now and then pick up or swirl your Marimo around so that the water can move through and circulate through it.

After all, the happier your Marimo, the better your luck will be!

DIY Mini Aquariums for office desk or kids room - fun and educational activities for kids

What are your favorite fun activities for kids?

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