3. Fancy Guppies
There is a wide variety of fancy guppies available to enjoy in both smaller and larger community aquariums. Given that they are schooling fish, it is often recommended to keep at least 6 together at any given. The basic aquarium size recommendation for guppies (and most other small schooling fish) is 10 gallons. However, if you have a school with both sexes, breeding is likely to happen. Fortunately, adult fancy guppies will eat their own young if they are not removed, so the population will typically not get out of control.