Care Guide

Dwarf Crayfish Care Guide

Practical care for Cambarellus dwarf crayfish, including Blue Brazos dwarf crayfish, CPO Mexican dwarf crayfish, and Cambarellus diminutus. Stable water, hides, food, and tank mate choices matter more than chasing perfect numbers.

Dwarf crayfish care water parameters

🌡Temperature

72 to 82 F

Room temperature to slightly warm. No heater usually needed unless your room drops below 70 F.

💧pH

6.6 to 7.4

Neutral to slightly acidic. Most tap water works. Stability matters more than hitting an exact number.

🧪GH

50 to 300 ppm

Moderate to hard. Calcium is important for exoskeleton development and successful molts.

🧪KH

40 to 120 ppm

Provides pH buffering. Adequate KH prevents dangerous pH swings.

⚠Ammonia / Nitrite

0 ppm

Must be zero. A fully cycled aquarium is essential before adding crayfish.

💧Nitrate

< 20 ppm

Keep low through regular water changes.

Tank requirements for Blue Brazos and other Cambarellus

🏠

Tank Size

Minimum 5 gallons for a pair. 10 gallons for a colony. Larger tanks provide more stable water and more territory.

🐟

Substrate

Fine gravel or sand. Dark substrates bring out the best coloration. Avoid large gravel that traps waste.

🛡

Filtration

Sponge filter is ideal. If using a hang on back filter, cover the intake with a prefilter sponge to protect babies.

🌿

Plants and Decor

Java moss, Java fern, Anubias, and floating plants. Add driftwood, rocks, and small caves or PVC pipe for hiding.

Dwarf crayfish care tank setup

PVC pipe sections make excellent hides

What They Need

🚧Places to hide

After molting their shells are soft and they need somewhere to go. Caves, tunnels, and plants will make them feel comfortable.

📏Horizontal space

Dwarf crayfish stay at the bottom 99% of the time. Floor space matters more than tank height.

🍃They're detritivores

Like Neocaridina shrimp, they eat dying and dead animals and plant matter. They clean up after themselves.

🌓Shade

They enjoy staying in the shade. Floating plants and overhangs help.

🌊Circulation

Dwarf crays explore the bottom. Having circulation moving things around keeps everybody happy.

Food and diet

Dwarf crayfish are true omnivores. In the wild, they feed on biofilm, algae, detritus, and small invertebrates. In the aquarium, they accept a wide variety of foods.

Recommended foods

  • Sinking pellets or wafers (shrimp/crayfish specific)
  • Blanched vegetables (zucchini, spinach, cucumber)
  • Algae wafers
  • Frozen or freeze dried bloodworms (occasional)
  • Indian almond leaves
  • Calcium rich foods (cuttlebone)

Feeding tips

Frequency

Small amounts every 1 to 2 days. Remove uneaten food after a few hours.

Variety

Rotate food types for better coloration and health.

Calcium

Critical for exoskeleton. Supplement with cuttlebone or crushed coral.

Molting

They eat their shed exoskeleton. Do not remove it.

Tank Mates

✓

Compatible

Small, calm fish

Endlers, ember tetras, chili rasboras

Shrimp

Healthy adult Neocaridina or Amano, with dense cover

Snails

Nerite, mystery, ramshorn

Other dwarf crayfish

Same species, with adequate hides and enough bottom space

⚠

Avoid

Large or aggressive fish

Cichlids, large barbs, bettas

Larger crayfish

Procambarus, Cherax

Bottom dwelling predators

Loaches, large catfish

The Breeding Cycle

  1. After a female dwarf crayfish molts, she may release pheromones that trigger active searching behavior in males.
  2. When receptive, the pair mates belly to belly for several minutes.
  3. The female then hides, lays her eggs, and attaches them to her swimmerettes.
  4. Egg counts vary, but small clutches of roughly 20 to 60 are common for many dwarf crayfish.
  5. For 3 to 4 weeks, she fans the eggs and removes any that fail to develop.
  6. During this period she hides more than usual and should have quiet cover and regular access to food.
  7. The young hatch as miniature crayfish and may stay near the female briefly.
  8. Once independent, the young need moss, leaf litter, and small hides to avoid being eaten by adults.
  9. After the brood is released, the female resumes normal feeding and activity.
  10. With stable water, cover, and food, the cycle can repeat as the colony matures.

Provide dense moss, leaf litter, and small caves to reduce predation from adults. The babies are fully independent from birth.

CPO dwarf crayfish breeding

CPO pair mating

Blue Brazos dwarf crayfish breeding

Brazos pair mating

Molting

Crayfish shed their exoskeleton to grow. This is the most vulnerable period in their life.

1

Pre molt

Reduced appetite, less activity, slightly cloudy appearance.

2

During

Splits the old shell and emerges soft. Usually at night. Do not disturb.

3

Post molt

Hides 1 to 3 days while hardening. Will eat the old shell for calcium. Never remove it.

4

Prevention

Adequate calcium, stable water, and proper GH prevent failed molts.

Shipping acclimation

After live shipping, keep the room calm and the aquarium lights low. Float the bag for 15 to 20 minutes to match temperature, then slowly add tank water over 30 to 60 minutes before moving the crayfish into a cycled aquarium with hides.

Feed lightly for the first day and give new arrivals time to explore. If you are ordering Blue Brazos dwarf crayfish, review the shipping page first so you understand weather holds, state restrictions, and live arrival terms.

Live shipping information

Dwarf crayfish care FAQ

Often, yes, but no crayfish is completely shrimp safe. They usually coexist best with healthy adult Neocaridina or Amano shrimp in planted tanks with plenty of hides.
About 1 per 2 to 3 gallons is a practical starting point. In a 10 gallon tank, 3 to 5 dwarf crayfish is comfortable when you provide plenty of hides.
They may nibble soft or dying plant material, but hardy plants like Java fern and Anubias usually work well. They prefer biofilm, algae, and prepared foods.
Hiding is common before or after a molt. Keep water stable, leave the animal alone, and make sure there are enough caves or plant cover.
Usually not. Most Cambarellus do well at room temperatures around 72 to 82 F. A heater is only useful if the room drops below about 70 F.
Float the bag 15 to 20 minutes, then slowly add tank water over 30 to 60 minutes. Move the crayfish into a cycled tank with hides and keep feeding light at first.
Domestically bred dwarf crayfish avoid international shipping stress and are already raised in aquarium conditions with prepared foods and stable water.

Ready to get started?

Browse our domestically bred dwarf crayfish.

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Care guide

After live shipping, give domestically bred dwarf crayfish time to settle into clean water with cover before heavy feeding.

How to keep Blue Brazos, CPO, and Cambarellus diminutus healthy

Dwarf crayfish care is straightforward when the tank is stable. Blue Brazos dwarf crayfish, CPO crayfish, and Cambarellus diminutus all need clean, cycled water, a mature bottom layer with biofilm, and enough hides to stay protected after molting.

Most problems come from unstable water, aggressive tank mates, or bare tanks with nowhere to hide. A planted 10 gallon aquarium with sponge filtration, leaf litter or wood, and several caves is a strong starting point for a small colony.

If you are still choosing a species, start with Blue Brazos dwarf crayfish for the Brazos color forms, Cambarellus diminutus for a very small species, or the shop page for current availability.