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Sixray Cory – A Comprehensive Guide (Aspidoras pauciradiatus)

The Sixray Cory, Aspidoras pauciradiatus, is one of those fish that flies completely under the radar—and honestly, it shouldn’t.

At a glance, it looks like a smaller, slightly different version of a typical Corydoras. But once you keep them, you realize they’ve got their own vibe—more delicate, a bit more subtle, and perfect for smaller, peaceful setups.

You’ll sometimes still see them labeled as Corydoras pauciradiatus, and in newer classifications, Gastrodermus pauciradiatus. Regardless of what name the store uses, the care stays the same.

Origin & Habitat

This species comes from Brazil, where it inhabits smaller river systems and tributaries.

In the wild, they’re found in:

  • Calm to moderately flowing water
  • Sandy or fine substrates
  • Areas with leaf litter and plant cover

They spend most of their time along the bottom, sifting through substrate for food—classic cory behavior.

Size

  • Adult Size: ~1 to 1.25 inches
  • Body Type: Small, streamlined catfish

These stay genuinely small, making them a great option for nano-style community tanks without going full pygmy cory.

Tank Size

  • Minimum Tank Size: 10 gallons
  • Recommended: 15–20 gallons

More important than tank size:

  • Keep them in a group
  • Give them room to forage

A larger footprint helps them feel more secure and behave naturally.

Water Parameters

  • Temperature: 72–78°F
  • pH: 6.0–7.2
  • Hardness: Soft to moderately soft

They’re not overly sensitive, but they do best in:

  • Clean, stable water
  • Slightly softer conditions

Like most small catfish, they don’t tolerate neglect well.

Temperament

  • Peaceful
  • Social
  • Non-aggressive

These are classic shoaling catfish and should be kept in groups.

Group size

  • Minimum: 6
  • Ideal: 8–12

The difference between 3 and 10 fish is night and day:

  • More activity
  • More confidence
  • Way more visible behavior

Tank Setup

This is simple—but important.

Ideal setup

  • Fine sand (best option)
  • Smooth substrate if not sand
  • Plants and cover
  • Driftwood or leaf litter

Why sand matters

They constantly sift the substrate.
Rough gravel can:

  • Damage barbels
  • Stress the fish
  • Reduce natural behavior

Think:

Soft-bottom, planted South American tank

Diet

Very easy to feed compared to a lot of nano fish.

Staple foods

  • Sinking pellets
  • Bottom feeder wafers

For best condition

  • Frozen foods (bloodworms, daphnia)
  • Live foods when possible

Important:
They are not just cleanup crew.

You need to make sure food actually reaches them—especially in community tanks.

Tank Mates

Because they’re small and peaceful, choose tank mates carefully.

Good tank mates

  • Small tetras
  • Rasboras
  • Pencilfish
  • Peaceful dwarf cichlids

Avoid

  • Large or aggressive fish
  • Hyper-competitive bottom feeders
  • Anything that will outcompete them for food

They do best in calm, balanced communities—not chaotic tanks.

Behavior

  • Bottom-dwelling
  • Constant foraging
  • Social and interactive within the group

They’ll:

  • Move together
  • Rest together
  • Explore constantly

It’s that classic “cory energy,” just in a smaller package.

Breeding

Similar to other cory-type fish.

Spawning basics

  • Egg layers
  • No parental care
  • Eggs often placed on surfaces or plants

To trigger spawning:

  • Heavy feeding with live/frozen foods
  • Clean water
  • Slight environmental changes (like cooler water changes)

If conditions are right, they may spawn without much effort.

Why They’re Underrated

Simple:
They don’t stand out in stores.

They’re:

  • Small
  • Subtle
  • Usually kept in basic tanks

So people walk right past them.

But in a proper setup:

  • They’re active
  • They add life to the bottom of the tank
  • They fit perfectly into smaller communities

They’re not flashy—but they’re extremely functional and enjoyable.

Final Thoughts

If you want:

  • A small, peaceful bottom dweller
  • Cory-like behavior in a compact size
  • A fish that fits perfectly in planted community tanks

The Sixray Cory is a great pick.

It’s one of those species that doesn’t get hyped—but once you keep them, you get it.

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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Corydoras Care 101: A Beginners Guide to these Fascinating Bottom-Dwellers

 

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