Tank size, water parameters, diet, temperament, reef-safety, and which species fits which keeper. All data cross-checked against vetted Fast Aquatics vendor records.
| Min tank size | 10 gallons |
| Care difficulty | beginner |
| Diet | Omnivore |
| Temperament | Peaceful |
| Reef-safe | n/a |
| Temperature | 74-80°F |
| Min tank size | 10 gallons |
| Care difficulty | beginner |
| Diet | Omnivore |
| Temperament | Peaceful |
| Reef-safe | n/a |
| Temperature | 74-80°F |
| Use case | Recommended |
|---|---|
| Best for nano tanks (under 30 gallons) | Blue Leg Hermit Crab |
| Hardiest in established tanks | Blue Leg Hermit Crab |
Pros: Hardier than Scarlet Hermit Crab for first-time keepers. Adult size fits 10 gallons tanks well. Easy to feed on standard pellet/flake/frozen diets. Reef compatibility: n/a.
Cons: Sourcing premium specimens can require waiting for charter breeder drops.
Pros: Hardier than Blue Leg Hermit Crab for first-time keepers. Adult size fits 10 gallons tanks well. Easy to feed on standard pellet/flake/frozen diets. Reef compatibility: n/a.
Cons: Sourcing premium specimens can require waiting for charter breeder drops.
Mixing Blue Leg Hermit Crab and Scarlet Hermit Crab in one tank depends on adult size overlap, territory needs, and water-chemistry match. Peaceful/Peaceful pairing means both species share similar temperament so direct fights are rare, but resource competition (food, territory, hiding spots) is common. Both species need water parameters within 74-80°F and 74-80°F. If keeping together, introduce the more peaceful species first by 2-4 weeks, provide multiple hiding spots, and feed at separate ends of the tank.
Both Blue Leg Hermit Crab and Scarlet Hermit Crab sell at three tiers on Fast Aquatics and competitor sites. Budget tier (pet-store grade): $5-50. Mid-tier (LFS or online vendor stock): $25-200. Premium tier (named lines, charter breeders): $100-2,000+. Captive-bred or aquacultured specimens cost more upfront but ship healthier than long-supply-chain wild-caught. Browse Blue Leg Hermit Crab and Scarlet Hermit Crab live availability on Fast Aquatics for current vendor pricing with carrier-tracked Buyer Protection on every order.
Both Blue Leg Hermit Crab and Scarlet Hermit Crab are at similar care difficulty (beginner vs beginner). For absolute first-time keepers, neither is ideal - consider a hardier alternative first.
Blue Leg Hermit Crab requires 10 gallons minimum, while Scarlet Hermit Crab needs 10 gallons. Both should be planned around adult size, not juvenile size.
Compatibility depends on adult size, temperament, and territory overlap. Both are typically considered peaceful (Blue Leg Hermit Crab) and peaceful (Scarlet Hermit Crab) species. Always quarantine both, introduce the more peaceful species first, and monitor for aggression in the first 30 days.
Pricing varies by source and grade. Budget specimens from pet-store-grade vendors run $5-50 for both species. Mid-tier specimens run $25-200. Premium grades (charter breeders, named lines) reach $100-2,000+. Browse Fast Aquatics for current market pricing.
Blue Leg Hermit Crab is rated n/a and Scarlet Hermit Crab is rated n/a. For mixed-reef setups, prefer the species rated reef-safe; species rated "with caution" or "no" need careful tankmate planning.
Blue Leg Hermit Crab: Omnivore. Scarlet Hermit Crab: Omnivore. Diet match-up matters for compatible feeding schedules and nutritional needs.
Browse the full comparison library for more side-by-side species breakdowns. See full care guides for Blue Leg Hermit Crab and Scarlet Hermit Crab for the complete husbandry breakdown of each.