Moderate
Betta spl. male Halfmoon Mustard
24–30°C · pH 6–7.5 · 38L
£37.99
Alien blue male betta, 6–7 cm in dense metallic mesh patterning. Aggressive — house alone. 24–30°C, 20–25 litres minimum.
Adult size is the maximum length this species reaches at full maturity (scientific sources). The livestock you receive will be younger and smaller — pick a size variant above for the actual shipping size. Photos are AI-enhanced, so the animal may show subtle colour or marking differences.
Betta spl. male Alien blue
Alien blue male betta, 6–7 cm in dense metallic mesh patterning. Aggressive — house alone. 24–30°C, 20–25 litres minimum.
Adult size is the maximum length this species reaches at full maturity (scientific sources). The livestock you receive will be younger and smaller — pick a size variant above for the actual shipping size. Photos are AI-enhanced, so the animal may show subtle colour or marking differences.
The betta fish is one of the most popular and most misunderstood freshwater species. This guide covers everything from proper tank size to the truth about tank mates.
Maintain these water conditions for optimal health and vibrant colors
Alien bettas look the part: dense metallic blue patterning laid in an intricate, almost reptilian mesh across body and fins, a colourway developed from wild-type crosses and unlike anything in the traditional show lines. This male measures 6–7 cm and carries the pattern edge to edge — under spot lighting the mesh effect is genuinely otherworldly.
Keep the romance for the viewing and the realism for the stocking plan. He is aggressive, moderate care, and his record permits little company: snails, plus peaceful shrimp in heavily planted tanks where some will still be eaten. It rules out other male bettas, fin-nipping fish — tiger barbs and many danios are named — large, aggressive or highly territorial species, and long-finned or brightly coloured fish that pull his attention into displays. He needs at least 20 litres and preferably 25 or more, heated to 24–30 °C, with pH 6.0–7.5 and hardness 1–15 dGH. A carnivore by record, he feeds and lives high in the water column, and his territorial behaviour strengthens around breeding condition — typical for lines close to wild stock.
Lines bred close to wild stock keep wild reflexes, and his daily behaviour shows it: faster startle responses, sharper feeding strikes, and a stronger reaction to movement above the tank than ornamental strains display. Site his aquarium somewhere with calm foot traffic and he settles noticeably quicker. Otherwise the record asks for the familiar: 20–25 litres or more, heater inside 24–30 °C, carnivore feeding, weekly changes holding pH 6.0–7.5 and 1–15 dGH. The mesh patterning is most dramatic under a single point-source light that lets the metallic scales flicker as he turns. With danios and tiger barbs expressly named on his avoid list, the snails-and-shrimp-only default is the path of least regret.
Alien-type males remain one of the most requested specialist bettas in the UK, and our stock is irregular — buy when listed rather than waiting. Despatch by licensed live-animal courier; live arrival guaranteed.
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