If hermit crabs don’t drink, they become dehydrated in 3 to 14 days. Also, their gills dry out, leading to suffocation. It takes longer, sometimes spanning several months. Their breathing gradually worsens.
Hermit crabs must have access to saltwater and freshwater in the tank. Never make saline water with table salt. Also, don’t use tap water as fresh water because chlorine is toxic to hermit crabs.
You can use aquatic sponges to provide additional water. Also, fruits and vegetables with high water content can be hydrating. These are supplements to drinking water, not replacements.
Hermit crabs also bathe in their drinking water, which is vital if they have parasites like mites.
Do Hermit Crabs Dehydrate Without Water?
Alongside sufficient humidity, hermit crabs need drinking water to avoid dehydration. Without it, keeping their gills moist will be increasingly difficult, resulting in suffocation.
Most hermit crabs live in a beachfront environment, which means they can access saltwater from the ocean. However, they rely on rainwater or dew gathered on plant life for freshwater.
Add one bowl of each water option for every 4 hermit crabs in the colony. The hermit crabs will want to submerge themselves in the water bowl to clean themselves and rehydrate.
How Long Can Hermit Crabs Survive Without Water?
According to the Italian Journal of Zoology, hermit crabs fill their shells with water after dark so they don’t run out. This means that you must refill the water bowls in the morning when you wake up.
How long hermit crabs can live without drinking depends on the following factors:
- Temperature. The hotter the tank, the sooner it’ll dry out.
- Humidity. Higher humidity levels and misting can sustain hermit crabs longer.
- Size. Larger hermit crabs need more water.
- Age. Young hermit crabs molt more frequently than adults, so they’ll likely drink more.
Any longer than 72 hours without water puts hermit crabs at risk of dehydration.
How Much Water Do Hermit Crabs Need?
Larger hermit crabs drink more water. If you have a colony of Purple Pinchers, they’ll drink more water than a similar number of Ecuadorians or Ruggies, which are smaller species.
Hermit crabs preparing to molt drink more, so check for signs that a molt is impending and increase water availability. They’ll also be thirstier if they eat dry food and exercise a lot.
One bowl should contain saltwater, while the other should contain fresh water. This will allow your hermit crabs to sip on the water during their waking hours.
Keep these water sources topped up so even the biggest hermit crab can submerge. Include a small ramp so they can easily escape the dish. Land hermit crabs drown if underwater for too long.
What Kind of Water Do Hermit Crabs Need?
Hermit crabs need two types of water in their tank: saltwater and freshwater.
Saline water can be obtained from a specialist pet store – the water used for saltwater fish will suffice. Alternatively, you can mix oceanic salt with spring water.
Saline water stimulates a hermit crab’s sense of smell, encouraging them to eat. Never apply table salt to water because the anti-coagulation agents in iodine are harmful.
Freshwater will be used for bathing and drinking.
While only one hermit crab species – Clibanarius fonticola – lives in a freshwater environment, they use freshwater to balance the salinity level of the water carried in the shell.
Can You Give Hermit Crabs Tap Water?
Never place unfiltered tap water in a hermit crab tank. Tap water contains chlorine, which blisters a hermit crab’s gills, reduces its ability to breathe, and eventually leads to suffocation.
Bottled water is the safest choice if you can’t dechlorinate tap water.
Tap water also contains trace heavy metals, especially copper. The negative impact of copper on hermit crabs’ health takes longer to manifest but can be just as harmful.
According to Oecologia, copper exposure makes hermit crabs twitchy and easily startled.
Instead, use a water purifier or distill the water. To achieve the latter, boil tap water until it turns to vapor, eventually condensing back to water devoid of heavy metals and chlorine.
The problem with distilled water is that it rids the water of essential minerals.
How Do Hermit Crabs Drink Water?
Hermit crabs have 3 sets of small mouth parts called maxillipeds for eating and drinking. You may also observe them using the maxillipeds to clean themselves, especially after eating or drinking.
When a hermit crab wants to drink, it moves close to the water source, usually climbing inside. It lowers its mouth until the maxillipeds are dipped into the water, lifting the water into the mouth.
At least some water will be dropped and lost in the process. Even if a hermit crab appears to be spending some time in a water bowl, it only consumes a handful of sips of water.
Do Hermit Crabs Gain Water from Food?
Fresh fruit and vegetables high in water and hermit crab-safe include:
- Cucumber.
- Watermelon.
- Apples (remove the pips.)
- Tomatoes.
- Carrots.
If the hermit crabs eat these foods, they’ll rehydrate. Food isn’t a substitute for drinking water.
Do Hermit Crabs Drink Water from Sponges?
Some hermit crab owners add aquatic sponges to an enclosure as an additional source of hydration, moisture, and even an emergency shell.
A wet sponge will maintain humidity and allow the hermit crabs to drink if a water dish is occupied.
Sponges are an optional extra, not a sole water source. They must also be removed and replaced every 48 hours, as sponges attract bacteria and mold that harm hermit crabs.
If you use sponges for a hermit crab’s hydration, seek specialist aquarium products. A generic kitchen or bathroom sponge may contain chemicals and unsafe materials.
Hermit crabs live in hot, moist conditions, so water is essential for survival. Assess the water level in the tank, replacing dirty water and replenishing empty dishes at least once a day.
