Brightwater: Aquarium Care

Tank care without the spreadsheet: quick water-test logging, safe-range charts, light-hour planning, an algae troubleshooter, and a guided nitrogen cycle.

Brightwater keeps your aquarium on schedule — and answers the questions every fishkeeper googles. Log water tests in seconds, get reminders that name the tank and the job, plan your light hours, and walk a brand-new tank through its nitrogen cycle day by day. No account, no ads, and your data never leaves your phone.

FAST LOGGING, WET HANDS WELCOME
A big-key quick-log sheet opens from anywhere: every parameter for your tank type (temperature, pH, ammonia, nitrite, nitrate, hardness — plus salinity, alkalinity, calcium and magnesium for reef tanks), prefilled with your last reading, with a plain-language interpretation as you type. Multiple readings a day, editable later, saved instantly.

CHARTS WITH GOOD AND WATCH RANGES
Every parameter charts over time with a shaded Good range, status-colored readings, and water-change markers. Premium keepers can set their own Good and Watch ranges per tank instead of the defaults.

A LIGHT PLAN FOR YOUR TANK
Tell Brightwater your tank type and situation and get a recommended photoperiod with the reasoning, a timer card ("ON 10:00 · OFF 18:00") to set your plug timer by, optional on/off reminders, and an honest note on the siesta method.

TWO TROUBLESHOOTERS: ALGAE OR CLOUDY WATER
Got algae? A step-by-step troubleshooter identifies what you're seeing and prescribes a numbered plan, and can apply the new light hours in one tap. Water gone cloudy, green, or tinted instead? A second troubleshooter walks the same way to a cited, numbered fix.

CYCLE A NEW TANK WITH CONFIDENCE
The guided nitrogen-cycle assistant walks fishless (dose-and-test) or fish-in paths day by day: what to do today, why the nitrite spike is normal, what stalls a cycle, and when it's safe to add fish — driven by your own readings, with honest "typically 2–6 weeks" expectations.

REMINDERS THAT KNOW YOUR TANK
Preloaded care schedules by tank type reschedule from when you actually did the job, with quiet hours respected and never a duplicate. A reading that drifts also joins that tank's Watching card, with one optional reminder to test it again.

DOSING, LOGGED THE WAY YOU ACTUALLY DOSE
Add whatever you use by name — no product database, no dosage advice. A quick-dose sheet prefills your last amount, undo is one tap, and every dose lands in the tank's history beside your test results. Logging is free with one schedule per tank; Premium adds extra schedules, reminders, and chart markers.

EQUIPMENT THAT REMEMBERS ITS OWN SERVICE
Track filters, heaters, lights and pumps with purchase dates, photos and notes, then log each service and see "last done 14 days ago" at a glance. Inventory and the service log are free.

EVERYTHING ELSE THAT BELONGS IN A TANK LOG
Inhabitants with history (sold, died, or moved between tanks — never deleted), a photo diary, notes, and a per-tank expense log. Export any tank's full history — readings and livestock both — as CSV, free, always, and import it back in: Brightwater reads its own exports and AquaticLog files in one tap, or walks you through a column mapper, skipping rows you already have.

BRIGHTWATER PREMIUM
• Unlimited tanks (1 free)
• Full chart history and multi-parameter overlays
• Set your own Good and Watch ranges per tank
• Light plans for every tank and both full troubleshooters
• The full cycle assistant beyond week one
• Custom care cadences and extra schedules
• Extra dosing schedules, reminders and chart markers
• Unlimited photos per diary entry

Subscriptions renew automatically unless cancelled at least 24 hours before the period ends. Manage or cancel anytime in your App Store settings. Payment is charged to your Apple ID.

Brightwater provides general hobbyist guidance with cited sources; it does not guarantee water quality, plant, or livestock outcomes, and it does not connect to or control any hardware.

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Bright water, healthy fish, no spreadsheet.