Polka Dot Hermit Crab

Polka Dot Hermit Crab requires a minimum of 30 gallons for healthy adults. The minimum is based on the species' adult size (1-2 inches), territorial range, and behavior pattern. Most Polka Dot Hermit Crab sold at small juvenile size will reach full adult size within 12-24 months and the system must be sized to the adult, not the juvenile.

The Polka Dot Hermit Crab needs a tank of at least 30 gallons, a temperature of 76-80°F (24-27°C) and pH 8.1-8.4. Adults reach about 1-2 inches and live 5-10 years. Best paired with peaceful tankmates of similar size and water-chemistry needs.

Polka Dot Hermit Crab requires standard reef parameters held tightly stable: Temperature: 76-80°F (24-27°C) Specific gravity: 1.025 (refractometer-measured) pH: 8.1-8.4 Alkalinity: 8-9 dKH Calcium: 420-450 ppm Magnesium: 1300-1400 ppm Ammonia + nitrite: Both 0 ppm Nitrate: Under 10 ppm Copper: 0 (lethal to invertebrates) Polka Dot Hermit Crab is sensitive to copper - never medicate the display tank with copper if Polka Dot Hermit Crab is present.

Polka Dot Hermit Crab is a omnivore. Eats a varied diet of pellets, frozen foods, and supplemental greens. Quality flake or pellet (Hikari, New Life Spectrum, Tetra) plus frozen mysis or bloodworms 2-3x weekly produces best color and behavior. Feed Polka Dot Hermit Crab appropriately for its size + activity level.

Polka Dot Hermit Crab is generally peaceful and compatible with most reef community species. Avoid keeping with predatory fish that view inverts as food: large wrasses (especially halichoeres + thalassoma), triggerfish, pufferfish, and certain large angelfish. Multiple Polka Dot Hermit Crab can share a tank but compete for food. Browse care guides for tankmate-compatibility tables for Polka Dot Hermit Crab and similar species.

Polka Dot Hermit Crab reaches 1-2 inches at adulthood with a captive lifespan of 5-10 years with proper care. Many marine inverts molt periodically; provide adequate calcium and a stable parameter regime to support healthy molts. The minimum is based on the species' adult size (1-2 inches), territorial range, and behavior pattern.

Polka Dot Hermit Crab is sensitive to copper, ammonia spikes, low oxygen, and rapid parameter swings. NEVER use copper medications in a tank with Polka Dot Hermit Crab. Symptoms of stress: reclusive behavior, color loss, refusal to feed, abnormal molting (incomplete or stuck molts). Most Polka Dot Hermit Crab deaths trace back to acclimation shock or parameter mismatch - drip-acclimate over 45-60 minutes when adding to a new tank.

Polka Dot Hermit Crab breeding in captivity ranges from straightforward (some shrimp, snails) to nearly impossible (most starfish, urchins) due to pelagic larval requirements. Captive-bred specimens are increasingly available from sustainable aquaculture facilities; check with vendors before assuming wild-caught origin.