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How to Raise Betta Fry (Complete Step-by-Step Guide)
Quick Answer
To raise betta fry successfully, feed microscopic live foods (infusoria, microworms) for the first 3–4 days after free swimming, then transition to baby brine shrimp. Maintain warm water (24–27°C), perform daily small water changes, and gradually increase tank size as they grow.
Raising betta fry is one of the most rewarding parts of fishkeeping — but also one of the most misunderstood. If you get the feeding and water quality right, your survival rates will skyrocket.
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Betta Fry Timeline (Critical Overview)
- Day 0–2: Eggs hatch (no feeding)
- Day 3–7: Free-swimming → NEED microscopic food
- Week 2: Growth phase begins
- Week 3–4: Transition to larger foods
- Week 4+: Juvenile stage
Stage 1: From Egg to Free Swimming (Day 0–3)
After spawning, betta eggs hatch into “wigglers.” At this stage:
- No feeding required (they absorb yolk sac)
- Male cares for nest
- Keep tank still and warm
IMPORTANT: Remove the male once fry become free-swimming (around day 3).
Stage 2: Free-Swimming Fry (Day 3–7)
This is where most people fail.
Fry are too small for normal food. You MUST feed live microscopic food.
Best First Foods:
- Microworms
- Infusoria
- Vinegar eels
👉 Recommended:
Buy Live Microworm Culture
Feed 3–4 times daily in small amounts.
Stage 3: Transition to Baby Brine Shrimp (Day 5–14)
Once fry grow slightly, you can introduce baby brine shrimp (BBS).
This is the single biggest growth booster.
- High protein
- Triggers aggressive feeding
- Rapid size increase
👉 Learn how to hatch:
How to Hatch Baby Brine Shrimp
Feed BBS 2–3 times daily.
Stage 4: Growth Explosion (Week 2–4)
At this stage:
- Fry actively hunt
- Growth rate increases dramatically
- Water quality becomes critical
Feeding strategy:
- Microworms (backup food)
- Baby brine shrimp (main diet)
- Introduce larger foods slowly
Why Scuds Are the Best Long-Term Food
Microworms are great early on — but for serious growth, scuds dominate.
- ✔ Higher nutritional value
- ✔ Better muscle development
- ✔ Natural hunting behavior
- ✔ Sustainable colony
👉 Upgrade your feeding:
Buy Live Scuds in Canada
Water Changes (MOST IMPORTANT FACTOR)
Dirty water = dead fry.
Follow this strictly:
- Daily 10–20% water changes
- Use aged, temperature-matched water
- Keep water shallow initially
Clean water = faster growth.
Tank Setup for Betta Fry
- Bare bottom tank
- Sponge filter (very gentle)
- Heater (24–27°C)
- Low water level (early stages)
No strong flow. Fry are weak swimmers.
Feeding Schedule (Simple)
Day 3–7:
- Microworms 3–4x daily
Day 5–14:
- Microworms + Baby Brine Shrimp
Week 2+:
- Main: Baby Brine Shrimp
- Optional: Introduce larger foods
Watch Real Fry Feeding (TikTok)
👉 Watch Betta Fry Feeding Live Foods
Common Mistakes (Avoid These)
- ❌ Feeding too late (fry starve fast)
- ❌ Using only dry food
- ❌ Poor water changes
- ❌ Strong filtration
- ❌ Overfeeding (causes ammonia spikes)
Growth Tips for Faster Results
- Feed small amounts frequently
- Use live food ONLY early on
- Keep water extremely clean
- Increase tank size gradually
Helpful Guides
Why Buy From Blackwater Aquatics?
- ✔ Canadian bred livestock
- ✔ High survival live foods
- ✔ Trusted by breeders
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FAQ – Raising Betta Fry
What do you feed betta fry first?
Microworms, infusoria, or vinegar eels. These are small enough for newborn fry.
When can betta fry eat brine shrimp?
Usually around day 5–7 once they are slightly larger.
How often should I feed betta fry?
3–4 times per day in small amounts.
How fast do betta fry grow?
With proper feeding, visible growth occurs within 1–2 weeks.
What is the best food for betta fry?
Microworms early, then baby brine shrimp, then scuds for long-term growth.
Final Strategy (Simple)
If you want high survival and fast growth:
- Start with microworms
- Transition to baby brine shrimp
- Upgrade to scuds
- Keep water clean daily
This is the exact formula used by successful breeders.