When I was a kid, I owned two goldfish that eventually outgrew the size of their tank. At the time, I didn't realize just how much actually goes into having fish and keeping them healthy. I've learned a lot over the past couple of years while keeping nano fish - a group of five celestial pearl danios and four corydoras habrosus - along with some live plants.
After filling up a 10-gallon tank with water and adding a filter, I was eager to add my first fish, but I soon found out that the tank must run without fish for several weeks to establish beneficial bacteria and create a stable underwater environment. But the work doesn't stop there. Ca …
DW News 
TechCrunch 
The Guardian 
