You have to love the individual Aquarium/Terrarium for your classroom or home.The 1/2 Gallon is perfect for a single Chinese Fighting Fish. The 1 Gallon makes a terrific terrarium for plants and the 1 1/2 Gallon is wonderful as a classroom aquarium or greenhouse. Best of all, each is made of plastic that is sturdy for all types of use. The molded " feet" on the bottom keep them from harming furniture. These are a great value and make an excellent learning tool for children of all ages. All Grades.