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Osteogaster hephaestus – A Comprehensive Guide (Fireball Cory)

The Fireball Cory, Osteogaster hephaestus (formerly Corydoras hephaestus), is one of the most striking cory-type fish in the entire hobby—and it doesn’t even rely on patterns to do it.

This fish glows.

Healthy specimens develop:

  • Deep orange to red tones along the body
  • A subtle but noticeable “fire” effect, especially under good lighting
  • A clean, streamlined look without heavy spotting or striping

It’s one of those fish that doesn’t need bold markings—because the color does all the work.

And unlike a lot of “nice in photos” fish, this one actually delivers in person. When they’re settled in and comfortable, they stand out from across the room.

Origin & Habitat

This species comes from Brazil, where it inhabits:

  • Slow to moderate flowing tributaries
  • Sandy-bottom environments
  • Areas with leaf litter and submerged structure

Like most cory-type fish, they are benthic foragers, spending their time searching the substrate for food.

They are typically found in:

  • Warm, stable water
  • Soft to moderately soft conditions
  • Environments with natural cover

Size

  • Adult Size: ~2 to 2.5 inches
  • Body Type: Streamlined cory build

They’re right in that mid-size range:

  • Not tiny
  • Not bulky
  • Just a clean, balanced fish

Tank Size

  • Minimum Tank Size: 20 gallons
  • Recommended: 20–30 gallons

As always with corys:

  • Floor space matters
  • Group size matters more than individual stocking

Water Parameters

  • Temperature: 74–80°F
  • pH: 6.0–7.2
  • Hardness: Soft to moderately soft

They do best in:

  • Clean water
  • Stable conditions
  • Slightly softer setups

Nothing extreme—just consistent, well-maintained water.

Temperament

  • Peaceful
  • Social
  • Non-aggressive

They should always be kept in groups.

Group size

  • Minimum: 6
  • Ideal: 8–12

In proper groups:

  • They’re more active
  • More confident
  • Way more visible

Tank Setup

This is where you really bring out their color.

Ideal setup

  • Fine sand substrate
  • Driftwood
  • Plants or botanicals
  • Moderate lighting

How to make them pop

If you want that “fire” look:

  • Use darker substrate
  • Avoid overly bright, washed-out lighting
  • Add contrast (wood, plants, shadows)

In the right setup, the color stands out way more.

Diet

Very easy to feed.

Staple foods

  • Sinking pellets
  • Bottom feeder wafers

For best color and condition

  • Frozen foods (bloodworms, brine shrimp)
  • Live foods when possible

A higher-protein diet helps:

  • Deepen coloration
  • Improve overall condition

Tank Mates

Great for peaceful community tanks.

Good tank mates

  • Tetras
  • Rasboras
  • Pencilfish
  • Dwarf cichlids
  • Other peaceful species

Avoid

  • Aggressive fish
  • Large predators
  • Extremely competitive bottom feeders

Behavior

  • Bottom-dwelling
  • Constant foraging
  • Social group interaction

They’ll:

  • Move in loose groups
  • Sift the substrate
  • Rest together

Classic cory behavior—but with way more visual payoff.

Breeding

Similar to other cory-type species.

Spawning basics

  • Egg layers
  • No parental care
  • Eggs placed on glass, plants, or decor

To trigger spawning:

  • Clean water
  • Heavy feeding
  • Slight temperature drops

With the right setup, they can spawn in captivity.

Why They’re So Popular Right Now

Simple:
They look insane.

  • Bright coloration without patterns
  • Standout presence in planted tanks
  • Still relatively uncommon

They check both boxes:

  • Collector appeal
  • Display tank appeal

Final Thoughts

If you want:

  • A cory that actually stands out
  • Strong coloration without heavy patterning
  • A fish that works in a community tank and looks like a centerpiece

The Fireball Cory is one of the best options out there.

This is not your average bottom dweller.

Looking to Add Fish to Your Aquarium?

If you're looking to add new fish to your aquarium, we recommend purchasing from trusted retailers known for their healthy livestock and excellent selection. The Wet Spot Tropical Fish has one of the best selections of rare and high-quality freshwater fish in the hobby, with excellent shipping and consistently healthy stock. Moonlight Aquatics is another fantastic source, especially for uncommon species and great prices on unique fish you don’t see everywhere. If you’re looking to add shrimp to your tanks, Buy Pet Shrimp specializes in hardy, well-bred freshwater shrimp that ship safely and arrive in great condition.

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