CPO Dwarf Orange Crayfish
Cambarellus patzcuarensis
A tiny bright-orange dwarf crayfish, peaceful enough for community and even some shrimp tanks.
| Difficulty | Beginner |
| Min. Tank Size | 40 L |
| Temperature | 18.0–26.0 °C |
| pH Range | 7.0–8.0 |
| Max Size | 4.0 cm |
| Lifespan | 2-3 years |
| Diet | Omnivore |
| Temperament | Semi-aggressive |
Overview
The CPO Dwarf Orange Crayfish (Cambarellus patzcuarensis) is a tiny bright-orange dwarf crayfish, peaceful enough for community and even some shrimp tanks. It reaches about 4 cm and can live for roughly 2-3 years with good care.
This guide covers everything in plain language: tank size and setup, water parameters, the best foods (with recommended brands), which shrimp and tank mates it can safely live with, breeding, and the common problems to avoid. It is rated Beginner to keep.
Natural Habitat & Origin
Crayfish are bottom-dwelling crustaceans from rivers, lakes and dams. They are territorial, like to dig and rearrange the tank, and must moult (shed their shell) to grow, hiding away and becoming soft and vulnerable for a day or two each time.
Tank Size & Setup
Provide at least 40 litres. Give it space, hides and a secure setup suited to its size and habits.
Use a soft sand or gravel bottom for digging, plenty of caves and one secure hide per animal, and a tight, weighted lid - crayfish climb out. Keep decor robust, as they rearrange everything.
Always add invertebrates only to a fully cycled, mature tank - they are far more sensitive to ammonia and nitrite than most fish.
Water Parameters
Keep the CPO Dwarf Orange Crayfish at 18-26 °C with a pH of 7.0-8.0, in moderately hard water (GH 8-20); they are happy in most Australian tap water once it is dechlorinated and stable.
Stability is everything for invertebrates: test regularly, keep ammonia and nitrite at zero and nitrate low, drip-acclimate new arrivals slowly over an hour, and make only small, steady water changes. Remember that copper - found in some fish medicines and plant fertilisers - is lethal, so always check labels.
Diet & Feeding
The CPO Dwarf Orange Crayfish is a omnivore. In Australia, good options include Hikari sinking carnivore/crab pellets, Dymax bottom-feeder pellets, blanched vegetables and the occasional protein treat; calcium is vital for moulting.
Feed lightly - invertebrates get much of their food from natural biofilm and algae, and overfeeding quickly fouls the water and triggers losses. A little, a few times a week, is plenty for most shrimp and snails.
Which Shrimp & Tank Mates Can Live Together?
Dwarf crayfish such as the CPO are small and mostly peaceful. They can usually live with fast-moving fish and even dwarf shrimp, though they may occasionally catch a slow or moulting shrimp. Do not keep them with larger crayfish, which will kill them. Provide one hide per crayfish to prevent squabbles.
Breeding
Crayfish can breed in the aquarium: the female carries eggs and then tiny crayfish under her tail. Separate the babies, as adults (and siblings) may eat them. Never release any crayfish or their young into local waterways.
Common Problems & Care Tips
Moulting is the riskiest time - the animal hides, goes soft and is vulnerable, so never disturb a moulting crayfish or crab, leave the shed shell in the tank for it to eat (it restores calcium), and make sure it has calcium and iodine in the diet.
Quarantine and acclimate all new livestock carefully, and watch daily for sluggishness, failure to eat or trouble moulting.
Is the CPO Dwarf Orange Crayfish Right for You?
The CPO Dwarf Orange Crayfish suits beginners and experts alike, as long as you can provide 40+ litres, the right water, copper-free conditions and suitable tank mates.
Get the basics right and these fascinating invertebrates are some of the most rewarding animals in the hobby. Use our aquarium tools to plan your setup and browse our fish and plant guides for safe tank mates.