Question: what can i put in a 1 gallon aquarium?
Answer: Betta Fish. One of the very best options that you can go with for a 1 gallon tank is the Betta fish. ... 
Guppies. Guppies are another great fish option to go with for a small 1 gallon tank. ... 
White Cloud Mountain Minnows. ... 
Tetra Fish. ... 
Goldfish.