Before You Start: Are You Ready?
Breeding bettas is not for beginners. It requires separate tanks, live food cultures, weeks of preparation, and the ability to care for 50-300+ fry that will eventually need individual housing. Before you begin, honestly assess whether you have the time, space, resources, and homes for the offspring.
You will need: a 10-gallon breeding tank, a 20-gallon grow-out tank (or multiple smaller tanks), live food cultures (infusoria, vinegar eels, baby brine shrimp), a heater, a sponge filter, and a lot of patience.
Selecting a Breeding Pair
Choose healthy fish that are 4-12 months old. Both male and female should have vibrant colors, active behavior, and no visible defects. Buying from a reputable breeder with known genetics is far better than using pet store bettas of unknown lineage.
The male should be in peak condition: flaring strongly, building bubble nests, and displaying bright colors. The female should be plump (full of eggs), have visible vertical breeding stripes (pale bars on the body), and show a white egg spot (ovipositor) near the anal fin.
Conditioning (2 Weeks)
Conditioning prepares both fish for spawning by boosting their nutrition and health. Feed both fish a high-protein diet of frozen bloodworms, brine shrimp, and premium pellets 3-4 times daily for 2 weeks before introducing them.
Keep the male and female in separate tanks where they can see each other through the glass or through a clear divider. This visual introduction stimulates breeding behavior: the male will build bubble nests, and the female will develop breeding stripes.
Setting Up the Breeding Tank
Fill a 10-gallon tank to 4-5 inches deep (shallow water helps fry reach the surface for air). Heat to 80°F. No filter for the first 2 weeks (fry are too small). Add a few floating plants (for bubble nest support) and a hiding spot for the female.
Place a clear container (like a cut plastic bottle or a hurricane lamp chimney) in the tank and put the female inside it. Add the male to the tank. This lets them see each other without contact.
Spawning
After 1-3 days of visual introduction, the male should have built a bubble nest and the female should show strong breeding stripes. Release the female.
Watch carefully. The male will display, flare, and chase the female. Some chasing and nipping is normal. If the male is excessively violent (drawing blood, the female is cowering in a corner for hours), separate them and try again in a few days.
When ready, the male wraps his body around the female in a "nuptial embrace," squeezing eggs out. He catches the falling eggs in his mouth and places them in the bubble nest. This embrace repeats multiple times over 1-3 hours.
After spawning ends, remove the female immediately. The male will guard the eggs alone — he may attack the female if she remains.
Egg to Fry (Days 1-5)
The male tends the eggs in the bubble nest for 24-48 hours, catching any that fall and replacing them. Do not disturb him during this period. Keep the light on 24/7 so he can see the eggs.
Eggs hatch in 24-48 hours. The tiny fry hang vertically from the bubble nest with their yolk sacs attached. They cannot swim yet.
By day 3-4, the fry become free-swimming — their yolk sacs are absorbed and they begin hunting for microscopic food. At this point, remove the male. He may eat the fry once they start swimming away from the nest.
Feeding Fry (The Critical Period)
Newly free-swimming fry are microscopic and can only eat the tiniest food. For the first 3-7 days, feed infusoria (microscopic organisms grown by placing a piece of lettuce in tank water for a few days), vinegar eels, or commercial liquid fry food like Hikari First Bites.
By day 7-10, fry are large enough to eat baby brine shrimp (BBS). BBS is the gold standard fry food — it produces the fastest growth and best color development. Hatch your own using a BBS kit with brine shrimp eggs, salt water, and an air pump.
By week 3-4, fry can eat micro worms, then crushed pellets as they grow. Feed 3-4 times daily. Keep food portions small but frequent.
Growing Out and Separating
As fry grow, begin small daily water changes (10% per day using airline tubing as a slow siphon — never a gravel vacuum, which will suck up fry). Add a gentle sponge filter at week 2.
By 6-8 weeks, males start showing aggression toward each other. Begin separating males into individual containers (cups, small jars, or a divided grow-out tank). Females can typically remain together in a group.
By 3-4 months, fry are old enough to sell, give away, or move to permanent tanks. Start reaching out to local fish stores, aquarium clubs, and online communities well before this point — finding homes for 100+ bettas takes effort.