Question: must have fish in aquarium?
Answer: Cory Catfish. If you've read other articles on my blog, you're probably aware that Cory Catfish are one of my all-time favorite freshwater aquarium fish. ... 
Guppies. ... 
Mollies. ... 
Swordtails. ... 
Kuhli Loach. ... 
Neon Tetra. ... 
Bristlenose Pleco. ... 
Betta Fish.