New Land Hermit Crab Parent Checklist (Week 1): Best‑Practice Setup + Daily Plan (2026)

Bringing home land hermit crabs is exciting — and a little different from most “starter pets.” This week‑1 checklist keeps it simple and best‑practice so your crabs can settle in safely.

Quick note: This guide is for land hermit crabs (the common pet-store type), not marine hermits.

The Week‑1 non‑negotiables (quick essentials)

Aim for at least 2 crabs (they’re very social crabs). If you have the space and budget, bigger groups can work well as long as the habitat is large enough and resources aren’t scarce.

Here’s what you actually need for week 1:

• Tank: Minimum 20‑gallon long for 2 crabs (bigger is always better)

• Secure lid: tight-fitting (helps hold humidity and prevents escapes)

• Heat source: under-tank heater (UTH) or heat mat designed for terrariums

• Thermometer + hygrometer: to track temperature and humidity

• Substrate (deep): enough depth for burrowing (see setup section)

• Two water dishes: one fresh + one saltwater (both treated properly)

• Water conditioner (dechlorinator): for tap water

• Marine salt mix: for the saltwater dish (not table salt)

• Food: a simple, varied hermit crab diet (plus calcium source)

• Extra shells: multiple options in the right size range

• Hides + climbing: at least 2 hides and safe climbing pieces

• Moss/humidity help: moss pit or moss area (optional but helpful)

Calm “base camp” setup (best practice, not complicated)

Think of base camp as: stable heat + stable humidity + deep substrate + enough space to feel safe.

1) Tank size (best-practice baseline)

• Minimum: 20‑gallon long for 2 land hermit crabs

• Best practice: go larger whenever you can. More space = less stress, fewer fights, and easier molting safety.

2) Substrate (deep enough to burrow)

• Use a deep, diggable substrate that holds tunnels.

• Plan for deep substrate depth (many keepers aim for several inches; more depth is better).

3) Heat + humidity (track it, don’t guess)

• Add your heat mat and place your thermometer/hygrometer where it reflects the crab zone.

• Use a tight lid to help maintain humidity.

4) Water: set up two dishes

You’ll want:

• Freshwater dish (treated with dechlorinator)

• Saltwater dish (made with marine salt mix)

Tip: choose dishes that are stable and safe to climb in/out of.

5) Hides, climbing, and “crab comfort”

• Provide at least two hides (so no one is forced to share)

• Add safe climbing items (cork bark, cholla, branches made for terrariums)

• Add a moss area if you can (many crabs love it)

Must‑have vs. can‑wait (week 1 priorities)

Must‑have (week 1)

• 20‑gallon long tank (minimum for 2)

• Secure lid

• Heat source

• Thermometer + hygrometer

• Deep substrate

• Freshwater + saltwater dishes

• Dechlorinator + marine salt mix

• Food + calcium source

• Extra shells (multiple)

• Hides + climbing

Can‑wait (week 2+)

• Upgraded décor and “theme” setups

• Extra enrichment pieces (more climbing options, tunnels, etc.)

• Backup gauges (nice to have)

• Additional feeding dishes and accessories

Quick “avoid these” list (common bad starter items)

Keep it simple — these are frequent problems in beginner kits:

• Tiny plastic carriers as a “permanent home”

• Painted shells (skip them, could be hazardous)

• Sponges as the main water source

• Table salt instead of marine salt mix (It is different)

• Shallow substrate that doesn’t allow burrowing (They like to burrow and climb)  

FAQs (week‑1 level answers)

Do land hermit crabs need to live together?

Yes — best practice is at least 2. More can work if the tank is large and resources (shells, hides, food) are plentiful. 

What if one crab buries itself right away?

That can be normal. They are probably acclimating so, avoid digging them up. Focus on keeping the habitat stable. Be patient.

Do I really need both fresh and salt water?

Yes — best practice is both, set up from day one.

How many extra shells should I offer?

More than you think, they can be slightly picky and competitive over shells. Offer multiple shells in the right size range(s) so all crabs aren’t forced to compete.

 

Day‑by‑day plan: your first 7 days

Day 0 (before they arrive): set up first

• Get heat/humidity stable

• Add deep substrate

• Set up fresh + salt water

• Add hides and climbing

Day 1: bring them home + keep it calm

• Place them into the habitat gently

• Keep handling minimal

• Offer food and let them explore

Day 2–3: observe and stabilize

• Check temperature/humidity daily

• Refresh food and water

• Don’t panic if they hide a lot

Day 4–7: build a simple routine

• Same feeding time daily

• Quick spot-clean as needed

• Keep offering shell options

• Continue low-handling while they settle

Want the deeper “why” (and the full care plan)?

If you want the full science behind the setup (plus longer-term care, troubleshooting, and best practices), check out our digital guide: Let’s Talk Hermit Crabs.