The Apistogramma borellii, commonly known as the yellow dwarf cichlid or umbrella cichlid, is a captivating South American dwarf cichlid found in the Paraguay River and Paraná River. Here are some key points about this species:

1. Appearance:
   • A. borellii displays two striking color morphs:
     • Opal: Brilliant yellow dorsal, caudal, and anal fins with a body color ranging from pale purple to intense blue. The gill cover features mottled red, yellow, and blue markings.
     • Blue: The more common morph, with blue hues throughout the body.
   • Both morphs have tall, sail-shaped dorsal fins and rounded, spade-shaped tails. Their bodies are deep and narrow, often with a zigzag-shaped band running down their backs.
2. Hardiness and Adaptability:
   • A. borellii is hardy and adapts well to various water conditions, including colder temperatures.
   • It’s an excellent choice for beginner aquarists due to its peaceful temperament.
3. Sexual Dimorphism:
   • Males and females show few apparent differences, making them challenging to distinguish.
4. Tank Setup:
   • Provide soft, acidic water conditions.
   • Dark substrate, dense planting, and ample hiding places are essential.
   • A secure tank cover is necessary as they can be prone to jumping.
5. Diet:
   • A. borellii feeds on insects and crustaceans.
6. Breeding:
   • Breeding pairs can be formed in spacious tanks with appropriate hiding spots.
   • Provide caves or flat stones for egg deposition.
   • The male guards the eggs and fry.