See the 30 days that led to today
Almost nothing in a fish tank fails instantly. It drifts, and a single reading cannot show you a slope.
Nitrate going 20 → 25 → 30 over three weeks is a stocking or feeding problem, not a water-change problem. A pH drifting from 7.4 to 6.9 between water changes is a hardness or substrate problem. Neither is visible in one test, and both are obvious on a chart.
What the charts are for
- Proving your water-change interval is right — or wrong — using your own numbers.
- Catching a heater that is slowly losing the fight before the fish do.
- Showing a cycle is finished because nitrite has been flat at zero for a week.
- Comparing two tanks that run the same schedule but not the same parameters.
Three windows, one dataset
Switch between 7, 30 and 90 days without re-entering anything. The 7-day window is for an active problem; the 90-day window is for deciding whether your routine is actually working.
Frequently asked
Are trends available on the free version?
Does it work for saltwater parameters?
Water Test Log
pH, ammonia, nitrite, nitrate, temperature and any custom reading — attached to the tank it came from, dated, and searchable.
Read →Maintenance Reminders
Water changes, filter cleaning, siphoning, top-offs and dosing — scheduled per tank, with overdue work surfaced on the Today screen.
Read →Feeding Log
One-tap feeding entries per tank, so “did I already feed them?” stops being a guess — and so does overfeeding.
Read →Stop guessing what your tank did last week
Log a test in twenty seconds, get reminded before maintenance is overdue, and keep a history you can actually read back. Free for one tank — no account, no subscription.
Open the App Store link →