Moderate
Betta spl. female Halfmoon Koi
24–28°C · pH 6–7.5 · 20L
£42.99
Female Alien green betta, a compact 5.5 cm in green metallic mesh. Semi-aggressive. 24–30°C, dGH 1–12, from 20 litres.
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. female Alien green
Female Alien green betta, a compact 5.5 cm in green metallic mesh. Semi-aggressive. 24–30°C, dGH 1–12, from 20 litres.
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
Green alien females are the compact jewel of the alien line: at 5.5 cm she is the smallest of our alien-type bettas, wearing the strain's metallic mesh in green iridescence that flickers as she moves through planted shade. Small fish, outsized visual impact — particularly in nano-scale aquascapes where larger bettas overwhelm the layout.
Her keeping profile suits her size. The recorded minimum is 20 litres, with water at 24–30 °C, pH 6.0–7.5 and a slightly narrower hardness band than most of our bettas at 1–12 dGH — worth checking against your tap water before ordering. She is semi-aggressive and moderate care: snails make safe company, peaceful shrimp may coexist in some setups though they can be hunted, and the avoid list covers other bettas, fin-nipping fish, aggressive or highly territorial species, large predators, and fast boisterous tank mates that stress her. A carnivore by record, she stays high in the water column and shows the species' territorial streak mainly around breeding condition. Beyond that, stable warmth and clean water are the entire job description.
Check your hardness before you order — her 1–12 dGH ceiling sits below the 15 most of our bettas tolerate, and very hard water areas may need rainwater or RO blending to bring the number down. That is genuinely her only complication. In suitable water she is a modest, manageable fish: 20 litres, heater anywhere in 24–30 °C, carnivore feeding scaled to her small frame, weekly maintenance inside pH 6.0–7.5. Her size recommends fine-grade foods and makes her a natural fit for detailed nano aquascapes where every centimetre of fish is on show. The green mesh patterning rewards close viewing distances — this is a fish for a desk or shelf you actually sit beside.
Green aliens appear in smaller numbers than blues in every import we receive; listed stock is live stock. Delivered UK-wide by licensed live-animal courier with our live arrival guarantee.
24–28°C · pH 6–7.5 · 20L
24–30°C · pH 6–7.5 · 20L
24–30°C · pH 6–7.5 · 20L
24–30°C · pH 6–7.5 · 20L
24–30°C · pH 6–7.5 · 20L
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