Hawaiian Red Shrimp

The Hawaiian red shrimp, known locally as "opae ula", lives in brackish pools near the coast of the Hawaiian Islands that are fed by seawater from underground. With its bright red color and a size of only 1 cm, it is one of the smallest shrimp in the hobby. Its ability to live for long periods on very little food has made it famous for sealed glass sphere ecosystems and small jar aquariums. Lifespans of over ten years have been reported in good conditions; its reproduction in the aquarium, however, is slow.

• 10 liters or more for a small group; lava rock and algae-covered stones are ideal.
• Slightly salty (brackish) water prepared with marine salt; do not change salinity abruptly, and top up evaporated water with fresh water.
• 22–26°C, alkaline water; it tolerates a wide range of changing conditions.
• A filter is not essential; gentle aeration and algae growing under light are enough.

It grazes on algae and biofilm on the rocks. If there is enough algae, extra food is hardly needed; a very small piece of spirulina once or twice a week is enough. Overfeeding is the most common cause of death in this species.

Completely peaceful; it roams the rocks in groups. Its color may fade with stress.

Good companions: It is best kept with its own species; nerite snails that tolerate brackish water can be added.

Avoid: All fish, freshwater shrimp (they need different water), products containing copper.