Try this DIY Freshwater Terrarium today. This project is simple yet beautiful. Requires little time and you will love the finished result. #diy #terrarium http://livedan330.com/2014/11/07/diy-freshwater-terrarium/
If you want to try this with a goldfish, consider a large enough vessel and filtration for the goldfish. Please see comments. NB as per a commentor, 5 gallons would not be enough. I urge anyone wanting to recreate this pin to consider the animal's health and well-being of utmost priority - well and truly before the aesthetic appeal of this terrarium idea. Better yet... don't try to recreate this.