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Overview:
The Blue Rim (frequently called the Blue Ring) Betta is widely considered the holy grail of modern, high-end Betta breeding. Known as a "patterned marble" strain, a high-grade specimen features an opaque, porcelain-white or cellophane-white body completely framed by a solid, unbroken band of vibrant electric-blue or royal-blue along the outer edges of its fins. When the fish flares, this vivid blue border traces a crisp, continuous outline around the body, creating a striking "ring" effect.
Origins:
While ancestral Betta splendens originate from the warm, shallow rice paddies and stagnant basins of Thailand, the Blue Rim morphology is a recent, highly prized line-breeding achievement. Most Blue Rim Bettas are bred in the Plakat (HMPK - Halfmoon Plakat) short-finned tail shape, though long-finned Halfmoons are also selectively produced.
Personality:
Like all male Bettas, the Blue Rim is fiercely proud, intelligent, and highly territorial. Plakat variants in particular are noticeably faster and more athletic than heavy, long-finned Bettas. They are exceptionally interactive, frequently swimming to the front glass, tracking your hands, and flaring enthusiastically at their own reflection.
Care Level: Easy to Intermediate
Temperament: Highly Territorial (Aggressive toward other males or similar-looking surface dwellers)
Diet: Carnivore (Thrives on high-protein Betta pellets, live/frozen bloodworms, brine shrimp, and daphnia)
Max Size: 5 â 6.5 cm
Family: Osphronemidae (Labyrinth fish)
Tank Size: 20 â 30 Litres minimum for a single male.
Temperature: 24°C â 28°C (Requires a reliable heater)
pH: 6.5 â 7.5
Should be kept in groups? No, strictly solo. Male Bettas must live completely alone in their own aquarium to prevent fatal fighting.
The "Grizzled / Marble" Reality: Because Blue Rim Bettas carry the famous Marble gene, their coloration is genetically unstable throughout their lifetime. It is extremely common for a pristine white Blue Rim to gradually sprout small blue spots on its body as it matures, or eventually turn solid blue. Keeping their water pristine, temperature stable ($26^\circ\text{C}$), and stress low helps maintain clean, sharp color boundaries.
Gentle Filtration: Strong water currents will exhaust them. Use an air-driven sponge filter or baffle a power filter output.
Resting Shelves: Provide broad-leaved live plants (like Anubias or Java Fern) or suction-cupped Betta Hammocks near the surface so they can easily rest close to the air.
Soft Decor Only: Avoid hard plastic plants or sharp rocks that can snag or tear delicate fin tissue.


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