Saltwater Fish · Shrimp
Blood Red Fire Shrimp
Lysmata debelius
Scarlet cave-dweller that cleans on its own termsIntermediate
- Lifespan
- 2-5 years
- Size
- 4-5cm (up to 2in)
- Social needs
- Singly; bonded pairs only in larger tanks
- Time
- Minimal beyond reef upkeep
- Cost
- Medium-high
- Diet
- Scavenger (frozen meaty foods, sinking pellets)
Overview
What is this animal?
- The fire shrimp is arguably the deepest-red animal in the marine hobby: a velvety, blood-scarlet body set off by long white antennae, white leg tips, and a scatter of tiny white spots.
- It is a close cousin of the skunk cleaner shrimp (Lysmata amboinensis), and the two are often sold side by side at very different prices, with the fire shrimp the pricier of the pair.
- Here is the honest part: unlike its bold cousin, the fire shrimp is a cave-dweller that spends daylight hours tucked under overhangs and emerges mostly at dusk.
- Buy it as a jewel you glimpse, not a centrepiece you watch — keepers expecting skunk-cleaner showmanship are routinely disappointed.
- Once settled it is peaceful, reef-safe, and surprisingly hardy, but it is still an invertebrate, and inverts play by stricter water-chemistry rules than the fish they live with.
Temperament
- Peaceful toward fish and completely reef-safe — corals, clams, and snails are ignored.
- It is shy rather than skittish; a settled fire shrimp will reach out from its cave to take food from a feeding stick and may set up a cleaning station that a patient fish visits.
- It is dusk- and night-active, and becomes noticeably bolder in dimly lit tanks or during long evening light periods.
- A moonlight or actinic-dusk setting is the best way to actually watch it forage.
- Check the stocking list both ways: hawkfish, large wrasses, triggerfish, and puffers eat ornamental shrimp, and a freshly moulted fire shrimp is soft and defenceless.
- It can in turn bully smaller or newly added shrimp over caves, so plan the invertebrate roster as carefully as the fish list.
A good fit for
- Mature, stable reefs with dim caves and rock overhangs
- Keepers content with a glimpsed jewel rather than a show cleaner
- Copper-free systems with rock-steady salinity
- Aquarists wanting a peaceful, reef-safe invertebrate
- Dimly lit or moonlit tanks where it will actually forage in view
Common mistakes to avoid
- Fast acclimation — the classic first-day killer
- Any copper medication in the tank or a shared water system
- Predators: hawkfish, triggers, puffers, and large wrasses
- Expecting skunk-cleaner boldness — it hides by day
- Housing two in a small tank — they may fight instead of pairing
Enclosure
Minimum 75 litres (20 US gallons)
Fine alone or with company. Singly; bonded pairs only in larger tanks
- A mature, stable reef of at least 20 gallons (75 litres) is the floor, and it must include dim caves and rock overhangs — a fire shrimp without a proper cave never truly settles.
- It typically claims a single den, often hanging upside-down from the ceiling of an overhang, and stays loyal to that spot for months.
- Keep salinity locked at natural-seawater strength, about 1.025-1.026 (roughly 35 ppt), and temperature steady at 24-26C (75-79F), with disciplined top-offs, because salinity swings are the classic invertebrate killer.
- Every mature Lysmata is a functioning hermaphrodite, so any two can form a breeding pair — but introductions in small tanks often end with one shrimp harassing or killing the other, so under about 40 gallons (150 litres) keep it singly.
- In tight quarters it may also squabble with other ornamental shrimp over prime caves, so give each shrimp species its own zone of rockwork.
Supplies
Setup
- Tank, stand and sump
- Return pump and powerheads
- Protein skimmer
- Reef lighting
- Rock and sand
- Salt mix, refractometer and test kits
- Quarantine tank
Ongoing
- Sinking marine pellets
- Frozen mysis shrimp
- Frozen chopped seafood blend
- Feeding tongs
- Turkey baster for target-feeding
- Iodine or trace-element supplement to support moulting
- Small thawing cup and strainer
Safe substrate: Aragonite sand · Dry or cured live rock · Bare bottom
Care routine
Daily
- Check salinity, temperature and flow
- Feed
- Head-count and look everyone over
- Top up evaporation with fresh water
Weekly
- Service the skimmer and filter socksevery 3 days
- Check for moults
- Clean the glass
- Test the water
Monthly
- Water changeevery 2 weeks
- Calibrate the refractometer
- Check labels for copper
- Check salt, RO/DI and reagents
Less often
- Deep-clean pumps and powerheadsevery 3 months
- Replace RO/DI filter mediaevery 6 months
Vet: Quarterly moult and stability review — every 3 months
Top resources for more info
Independent creators and organisations we would send a friend to. We have no affiliation with any of them, and nothing here is sponsored. Links checked 2026-09-19.
YouTubers
HumbleFish & ReefSaltwater fish disease, quarantine and treatment (Humble.Fish forum)BRStvReef tank setup, fish health and quarantine series (run by a retailer)FishOfHex AquaticsBeginner saltwater guides, avoiding common mistakes and tank disasters
Sites
Go deeper
Diet
- Fire shrimp are scavengers first and cleaners a distant second — they will pick parasites and dead tissue from fish, but far less reliably and far less publicly than a skunk cleaner.
- Never count on cleaning behaviour to feed the shrimp or to manage parasites on your fish.
- Target-feed sinking meaty foods several times a week: frozen mysis, brine shrimp, chopped clam or prawn, and sinking pellets or wafers dropped near the cave mouth.
- Feeding at dusk or just after the main lights dim matches its natural schedule and stops faster fish intercepting everything.
- In a normally stocked reef, leftovers and biofilm usually keep it fed, but in ultra-clean, lightly stocked tanks a fire shrimp can quietly starve in its cave — confirm it is actually eating.
Health
- Acclimation is the single biggest risk: drip-acclimate slowly over one to two hours, because sudden salinity changes cause fatal osmotic shock.
- More fire shrimp die on their first day than in all the years that follow.
- Copper is lethal to shrimp at the doses used to treat fish, so never use copper-based medications in the tank or any shared water system, and be wary of second-hand equipment from copper-dosed fish-only setups.
- Keep pH stable around 8.1-8.4, ammonia and nitrite at zero, and nitrate low; invertebrates fail before fish do when water quality slips.
- Moulting every few weeks is normal, and the shrimp hides for a day or two afterward while the new shell hardens.
- A complete cast shell on the sand looks alarmingly like a dead shrimp, so check the cave before you panic.
- Repeated failed moults point to swinging salinity, a depleted salt mix, or poor nutrition, and are usually fixed by steady, regular water changes and varied feeding.
Is your enclosure big enough?
Minimum volume75 litres (20 US gallons)
CompanyFine alone or with company. Singly; bonded pairs only in larger tanks
Is this urgent?
In a reef, stability matters more than any single target number. A parameter moving fast does more damage than a parameter sitting slightly off.
Go now
Any detectable ammonia or nitriteWater change now with matched, mixed and aerated saltwater. Stop feeding. Directly toxic, and a marine system has less margin than a freshwater one.
NowTemperature or salinity has moved sharplyCorrect slowly, over hours, not minutes. Check the heater and the top-off. The speed of the change does the damage. Correcting fast repeats the injury in the other direction.
NowRapid gilling, or a fish hanging in the flow breathing hardIncrease aeration and check temperature and salinity. Warm water holds less oxygen, and a heater failure shows up here first.
NowToday
White spots, or a fine dusting like icing sugarIdentify which parasite before treating. Most reef tanks cannot be treated in place. The two common parasites look similar and need different handling; velvet can kill a tank in days.
TodayCorals closed for more than a day, or receding tissueTest alkalinity first, and compare it against the last reading rather than a target. Unstable alkalinity is the most commonly cited coral killer, and a swing shows up in the trend, never in a single point.
TodayA new fish added without quarantine now looks unwellRemove it to a separate system today if you can. Nearly every wipeout in a reef tank traces back to a skipped quarantine.
TodayQuarantine every new animal, including corals and inverts. It is the single practice that separates a reef that lasts from a reef that restarts.
This is general guidance for a healthy adult, not a diagnosis. An exotics vet who knows your animal always overrides it — and the time to find one is before you need one.
What it really costs
Setup, monthly, first year and across a whole life, itemised and with the electricity worked out from the actual wattage. Published figures for the same animal disagree by a factor of four, so the calculator shows ranges rather than picking one.
Bedding and substrate
In a marine system the rock and the sand are life support, and how you start them decides the first six months.
Safe
Aragonite sandThe standard marine substrate. Buffers pH and hosts the biology.
safeDry or cured live rockDry rock avoids importing pests but takes longer to mature. Cured rock is faster and riskier.
safeBare bottomCommon in high-flow systems. Easier to keep clean, but it removes a large part of the biological buffer.
safeWith a caveat
Deep sand bedsPowerful nutrient processing when they work and a sulphide release when they are disturbed. Choose shallow or deep deliberately, not by accident.
with a caveatUncured live rockIt will cycle the tank for you, and it will also bring in whatever was living in it.
with a caveatNever
Silica play sandDoes not buffer, and it is commonly blamed for feeding diatom blooms in a new tank.
neverAny rock or decor of unknown originMetals and phosphate leach for months and are almost impossible to trace once the tank is running.
neverThis is our general list for saltwater fish. We have not built one specific to Shrimp yet.
My kit says 0.25 ppm. Is that dangerous?
A liquid kit measures total ammonia, but only the un-ionised fraction is really toxic, and that fraction is governed by pH and temperature — each whole pH unit multiplies it roughly tenfold. So the same reading can be nearly harmless in one tank and lethal in another; this works out which one you are in.
Compare with other animals
The same axes for every animal, side by side — the way the guides are written makes that a fair comparison rather than two articles.
Keep going
Shrimp, side by side
Same axes, same care guides — the honest way to choose between types.
See all Shrimp side by side →
