First, minnows are very active fish and need plenty of space to swim. A good rule of thumb is to provide at least 10 gallons of water per minnow. Second, minnows are scavengers and will eat almost anything, including plants and other fish. If you plan to keep minnows with other fish, make sure to choose fish that are compatible with minnows' aggressive nature.
Third, minnows are very susceptible to disease. They can easily contract diseases from other fish, plants, or even the water itself. It is important to keep the aquarium clean and free of debris, and to quarantine new fish before adding them to the aquarium.
Finally, minnows are not long-lived fish. Most minnows will only live for about two years in an aquarium, although some species may live for longer.
If you are considering keeping minnows in an aquarium, it is important to do your research and make sure you are prepared to provide them with the proper care. Minnows can be fun and rewarding to keep, but they require a bit more care than some other fish.