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For saltwater & reef keepers

Your reef, understood.

Reef tanks are less forgiving than freshwater — a coral shows stress days before a fish would, and the numbers that keep it alive move on their own. AquaLens was built for both sides of the hobby: it identifies coral, marine fish, and inverts from a photo, reads your reef test kit, and keeps alkalinity, calcium, and magnesium steady with dosing you can actually pace.

  • Point your camera at a coral, clownfish, or invert and get an identification that links to a care guide — reef-safe status, placement, flow, and lighting included.
  • Scan a Hanna checker or liquid test kit and AquaLens logs alkalinity, calcium, magnesium, nitrate, and phosphate, flagging anything out of the reef range.
  • The Reef Dosing tools tell you not just how much to add, but how many days a correction should take so you never shock your corals.
  • Every reading builds your tank's history — the app warns you when alkalinity starts drifting, while the fix is still a small dose.

Get AquaLens for your reef.

Free to start — coral and fish ID, test-kit scanning, chemistry trends, and dosing tools in one app for iPhone, iPad, and Android.

Download on theApp StoreGet it onGoogle Play

900+ keepers · 1,500+ tanks tracked · free to start

Browse 540+ saltwater species guides →
AquaLens identifying an ocellaris clownfish and showing a compatible reef starter care card

Built for the reef, not adapted to it

The same features freshwater keepers use, tuned for saltwater realities: coral pathology, the big-three chemistry, salinity, and dosing schedules.

AquaLens flagging critical tissue necrosis on a torch coral with a pathology scan
Catch health warnings earlyA pathology scan flags tissue recession on a torch coral before it becomes rapid tissue necrosis.
AquaLens reading a reef test kit and flagging a high phosphate reading
Log tests in secondsSnap your Hanna checker or test kit — AquaLens reads alkalinity, calcium, magnesium, and nutrients and flags a phosphate that's high for a reef.
AquaLens chemistry trend chart showing alkalinity and salinity over 90 days
See alkalinity swings comingChemistry trends plot alkalinity, calcium, magnesium, and salinity together so you catch drift before corals brown out.
AquaLens auto-dosing schedule for reef trace and iodine supplements
Never miss a doseSchedule two-part, trace, and iodine dosing with reminders that log themselves to the journal.
AquaLens guidance loop turning tests and logs into a personalized next step
Guidance that knows your tankTests, logs, and livestock feed personalized next steps for your specific reef — not generic advice.
AquaLens financial tracker showing reef livestock spending and coral sales
Track what the reef really costsLivestock, hardware, salt, and energy in one place — and the coral frags you sell back.

Free reef calculators

Every number shows its work. No account needed — run them right here in your browser.

Big-three chemistryReef Dosing CalculatorAlkalinity, calcium, and magnesium — how far off, and how fast to correct it safely.Specific gravity ↔ pptSalinity ConverterConvert readings and check them against the standard reef target range.Mixing daySalt Mix CalculatorHow much salt to reach your target salinity for a new batch or a top-up.Plan your livestockStocking Plan BuilderSwitch to saltwater and plan a stable reef around real tank constraints.

Saltwater guides

Practical, honest starting points for the reef — the parameters, the cycle, quarantine, and where to buy livestock without importing pests.

Fish-Only vs Reef: Choose Your Setup

The honest trade-offs between FOWLR and a full reef — cost, difficulty, and what to buy first.

Cycle a Saltwater Tank with Live Rock

How the marine nitrogen cycle really works, and how to know when it's safe to add your first fish.

Reef Parameters Explained

Salinity, alkalinity, calcium, magnesium, nitrate, and phosphate — what each does and where to keep it.

Marine Quarantine: Ich & Velvet

The one habit that saves whole displays — how to quarantine new fish against the diseases that move fast.

Coral Placement, Flow & Lighting

Where softies, LPS, and SPS go, how much flow and light they want, and how to acclimate them.

Where to Buy Corals & Marine Fish

Reputable online vendors, captive-bred vs wild, dipping and quarantine, and honest price ranges.

540+ saltwater species, with real numbers.

Clownfish to tangs, cleaner shrimp to SPS — every guide covers parameters, reef-safe status, placement, and temperament. Filter the library to saltwater and start browsing.

Browse saltwater species

Give your reef a memory.

Every test, dose, and coral photo becomes your tank's history — and history is what catches an alkalinity swing while the fix is still cheap. Free to start on iPhone, iPad, and Android.

Download on theApp StoreGet it onGoogle Play

900+ keepers · 1,500+ tanks tracked · free to start