Medium-sized ornamental fish are those suitable for medium-sized aquariums. They are typically large and require ample swimming space. Below are some common varieties of medium-sized ornamental fish and their detailed descriptions:
1. Molly (spinytail seabream) :
Appearance characteristics : Spiny tail seabream come in a variety of colors, such as red, black, and orange, with colorful spots or patterns on their bodies and distinctive tail features.
Habits : Spinetails are ornamental fish that can be kept in a wide temperature range and are not demanding in terms of water quality, making them suitable for beginners.

2. Red Fiery Qilin (Platy) :
Appearance characteristics : The Red Fire Kirin has a flattened body and displays bright colors such as orange, red, and yellow. It is a lively and active ornamental fish.
Keeping conditions : Red Fire Kirin is not very demanding in terms of water quality, adapts to mild water temperature and pH level, and is suitable for keeping with other peaceful fish.
3. Swordtail :
Appearance characteristics : Swordtails have long, pointed tail fins and often display various colors and patterns on their sides, making them an elegant ornamental fish.
Habitat : Swordtails are gentle in nature and can coexist with other peaceful fish. They have moderate requirements for water quality and temperature.
4. Blue Gourami :
Appearance characteristics : Blue tang has a beautiful body shape and a blue appearance, with a silvery-blue metallic luster.
Habits : Blue tang is a gentle ornamental fish that has a certain need for aquatic plants and requires a suitable hiding place.
5. Violet Kribensis :
Appearance characteristics : The Violet Dipper has bright colors such as purple and yellow on its sides and likes to stay at the bottom of the aquarium.
Habitat and habits : The Violet Dipper is an ornamental fish that is highly adaptable to water quality and is suitable for beginners, but it may be somewhat aggressive during the breeding season.
Medium-sized ornamental fish typically possess diverse and rich physical characteristics and have relatively mild requirements regarding water quality and temperature, making them suitable for fish enthusiasts to enjoy in medium-sized aquariums. When keeping these fish, it's essential to understand their feeding habits and living requirements to provide a suitable environment for their health and well-being.