🐟 How I Hatch Mop-Spawning Killifish Eggs (The Easy Way)

So you’ve got some mop-spawning killifish eggs and you’re staring at them thinking… now what? Relax. It’s way easier than it looks. Here’s how I do it step by step.

📦 Getting Your Eggs

When I send eggs, they come in:

• A tiny test tube
• A little box
• Sometimes even a foil pouch

Why? Shipping can be rough, and I like my eggs to arrive happy and intact.

⚠️ Note: Some countries (Australia, South Africa) are super strict about live eggs—double-check before ordering!

🪣 Choosing a Hatching Container

You don’t need anything fancy:

• A little dish
• A mini tank
• A shallow plastic box (my personal fav because I can stack them 😎)

Keep the water shallow so you can keep an eye on the fry. If you’re breeding multiple species, stackable boxes are a lifesaver.

💧 Water Prep

Here’s the golden rule: warm water only.

• Tap water? Let it stand 24+ hours to remove chlorine.
• Old tank water? Even better.
• Keep it warm—room temperature is a must.

🚫 Pro tip: Don’t pour eggs into cold water. Instant heartbreak.

🐣 Hatching the Eggs

• Pour the eggs from the test tube into your prepared water.
• Depending on the species, hatching can take a couple of days to 2 weeks.
• Mob-spawning killifish don’t hatch all at once, and that’s okay—nature spreads them out for survival.

🍴 Feeding Tiny Fry

Tiny fry = tiny food. Start with:

• Infusoria or Paramecium for the first 2–3 days
• Then switch to brine shrimp

💡 Tips for happy fry:

• Add live plants for hiding spots and to encourage infusoria growth
• Keep fry well-fed
• Remove dead brine shrimp to avoid water problems

🌡 Water Conditions

Most mob-spawners are tough cookies:

• Neutral pH tap water works fine
• Room temperature (~22°C+)
• Some species need soft or hard water—your breeder will guide you

🎯 Hatch Rate Reality

Even pros don’t get 100% hatch. If you order 20–30 eggs, don’t expect them all to hatch.

• Semi-annual or annual killifish may need multiple attempts over weeks or months.

✅ Final Thoughts

Keep it simple:

• Warm, shallow water
• A few plants
• Tiny first foods
• Patience

Before you know it, you’ll have a tank full of tiny, happy fry swimming around. 🐠