Betta Blue Rim

The Blue Rim betta: an electric-blue edge on fins built for still water.

Betta Blue Rim: stunning blue-edged betta with vibrant colours. Easy care for beginners. Perfect for planted nano tanks. Shop now for healthy live fish.

• Overview: The Betta Blue Rim is a striking colour morph of the popular Betta splendens, also known as the Siamese fighting fish. This variety is prized for its brilliant blue body and the distinctive lighter blue or white rim that outlines its fins, creating a breathtaking contrast. Each fish is unique, with patterns varying slightly. Blue Rim bettas are available in various tail types, including halfmoon, plakat, and veiltail. They are hardy, intelligent, and full of personality, making them a fantastic choice for both beginner and experienced aquarists. Typical adult size is 6–7 cm (2.5–3 inches) for males, with females slightly smaller. With proper care, they can live 3–5 years. This listing is for a single live fish, not a pair, as males are territorial and must be kept alone or with carefully chosen tank mates.
• Water Conditions: Betta Blue Rim thrives in warm, clean water that mimics its native Southeast Asian habitat. Ideal temperature range is 24–28°C (75–82°F), and a reliable aquarium heater is essential to prevent fluctuations. The pH should be slightly acidic to neutral, between 6.5 and 7.5. Water hardness can range from soft to medium hard (5–20 dGH). Ammonia and nitrite must always be zero, and nitrate should be kept below 20 ppm through regular water changes. Because bettas are labyrinth fish, they must have access to the water surface to breathe atmospheric air, so leave a small gap between the water line and the tank lid. Use a gentle filter, such as a sponge filter or a baffled power filter, as strong currents stress them out. Adding Indian almond leaves or driftwood releases tannins, which naturally lower pH and provide antibacterial benefits. Always use a water conditioner to remove chlorine and chloramine. Stability is more important than chasing exact numbers—avoid sudden changes in temperature or chemistry.
• Suitable Tank Mates: Choosing the right companions for your Betta Blue Rim is crucial because males are territorial and may attack or be attacked by other fish. Avoid any fin-nipping species, as they will shred the betta's beautiful fins. Good tank mates include small, peaceful schooling fish that occupy different areas of the tank. Examples: neon tetras, ember tetras, chili rasboras, harlequin rasboras, and lambchop rasboras. Bottom dwellers like corydoras catfish (such as pygmy corys), kuhli loaches, and otocinclus are excellent choices. Snails, including nerite and mystery snails, are generally ignored and help clean algae. Shrimp may be eaten, so only add them if you have plenty of hiding places and accept the risk. Fish to avoid: guppies (often nipped), tiger barbs, serpae tetras, angelfish, cichlids, goldfish, and any large or aggressive species. Never house two male bettas together, and do not mix bettas with other anabantoids like gouramis. If you want a community tank, aim for a 10-gallon (38-litre) or larger aquarium with plenty of plants and hiding spots to break lines of sight. Always monitor for aggression and have a backup plan to separate if needed.
• Feeding Habits: Betta Blue Rim is a carnivorous micropredator. In the wild, it feeds on small insects, larvae, and crustaceans. In the aquarium, offer a high-protein diet to maintain vibrant colours and good health. The staple should be high-quality betta pellets specifically formulated for carnivores. Look for pellets with fish meal, krill, or shrimp as the first ingredient. Supplement with frozen or live foods 2–3 times per week: bloodworms, brine shrimp, daphnia, mysis shrimp, and blackworms. These treats mimic their natural diet and encourage natural hunting behaviour. Feed small amounts 2–3 times daily, only what your betta can consume in about 2 minutes. Overfeeding is a common mistake that leads to bloating, constipation, and swim bladder disease. If your betta looks bloated, fast it for 24 hours and then feed a shelled pea (though bettas are carnivores, a small piece of pea can help clear the gut). Remove any uneaten food immediately to avoid fouling the water. Betta Blue Rim may also eat small tank mates like shrimp fry, so consider that when stocking. Each betta has individual preferences, so be patient and offer variety.
• Care Requirements: Proper care ensures your Betta Blue Rim lives a long, healthy life. Minimum tank size is 5 gallons (19 litres) for a single betta, but 10 gallons (38 litres) is recommended for stable water parameters and more room to explore. The tank must be cycled before adding your fish. Use a heater and gentle filter. Perform weekly water changes of 25–30%, vacuuming the substrate to remove debris. Always match the temperature of new water to the tank and use a dechlorinator. Keep a tight-fitting lid because bettas are excellent jumpers. Provide plenty of live or silk plants, caves, and floating plants to reduce stress. Bettas enjoy resting on broad leaves, so include an Indian almond leaf or a betta hammock. Acclimate your new fish carefully using the drip method: float the bag for 15 minutes, then slowly add tank water over 30–45 minutes before releasing. Monitor for common diseases such as fin rot, ich, velvet, and columnaris. Early signs include clamped fins, lethargy, loss of appetite, and white spots. Quarantine new tank mates to avoid introducing pathogens. Avoid overfeeding and keep the water clean. With proper care, your Betta Blue Rim will reward you with its stunning colours and engaging personality for years. This fish is a live animal; please ensure you are prepared for its care before purchase.