If you have kids and want an easy way to teach them a little science or if you just want another critter tank..Biospheres are great. They actually sell kits for these but they are super easy to make. I use 1 gal fish bowls covered with a piece of plastic. A layer of substrate..sand and few small rocks.. I also added some natural non-clumping kitty litter..but its not needed.. Add some cherry shrimp and some Hornwort and Elodea.
No heater needed .. no airpump. Feed shrimp sparingly.
Place where it gets bright indirect light or use a small LED Ring light ($10 amazon)
The shrimp produce ammonia and carbon dioxide.. the plants are oxygenators.. Elodea is used in labs and classrooms for its photosynthesis processes.
This particular sphere has been running months now.
I have mine on my office desk east facing window.
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That big green root is a house plant I am rooting .
Anyhow.. its a real easy to make..relaxing to watch. I have about 20 shrimp in there.
Al
