Demo Reef Charts

Combined Parameter Trends · All Data

24 Hours 3 Days 15 Days 30 Days All Data

Each parameter is normalized to its ideal range: 0% = low end, 100% = high end, shaded. Values past −50% or 150% are pinned to the edge with their real reading. Hover for actual values.

Bridge readings older than 24 hours are summarized at 5-minute, 1-hour, and daily intervals to keep the chart fast. Manual entries are kept as-is; after your last manual reading the line carries forward dashed to today. Learn more

Individual Parameter Trends

Alkalinity 7.00–11.00 dKH

Calcium 400–550 ppm

Magnesium 1250–1400 ppm

Phosphate 0.06–0.30 ppm

Nitrate 5.0–50.0 ppm

Salinity 1.025–1.027 sg

Temperature APEX 76.0–82.0 °F

pH APEX 7.80–8.55

ORP APEX 250–400 mV

Nitrite 0.00–0.20 ppm

Ammonia <0.10 ppm

Maintenance

3 overdue12 not logged yet

↓ CSV

Rinse or replace filter socks
Weekly · Done 186d ago
Overdue 179d
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How often
Wipe front glass
Weekly · Done 186d ago
Overdue 179d
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How often
Clean powerheads & circulation pumps
Monthly · Done 186d ago
Overdue 156d
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How often
Empty protein skimmer cup
Weekly
Not logged yet
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How often
Water change (10–15%)
Every 2 weeks
Not logged yet
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How often
Gallons changed
Clean skimmer neck
Every 2 weeks
Not logged yet
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How often
Check return pump flow
Every 2 weeks
Not logged yet
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How often
Rinse filter media in old saltwater
Monthly
Not logged yet
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How often
Check RO/DI TDS (replace if >2 ppm)
Monthly
Not logged yet
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How often
Inspect fittings for salt creep
Monthly
Not logged yet
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How often
Trim chaeto in the refugium
Monthly
Not logged yet
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How often
Replace RO membrane & DI resin
Every 3 months
Not logged yet
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How often
Deep clean skimmer body
Every 3 months
Not logged yet
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Check & calibrate heater
Every 3 months
Not logged yet
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Inspect overflow & drain lines
Every 3 months
Not logged yet
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Top off RO/DI reservoir
Weekly · Done 4d ago · reservoir refilled
Next in 3d
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Check salinity & temperature
Weekly · Done 2d ago · from your log
Next in 5d
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How often
Test ammonia, nitrite, nitrate & alk
Weekly · Done 2d ago · from your log
Next in 5d
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How often

Tap ✓ when a task is done. Logging a test or a water change checks its task for you, and your Bridge marks the top-off when the reservoir is refilled. No reminders are sent.

Tank notes

No notes yet. Notes show on the chart as an amber flag on their day.

Current Parameters

Alkalinity

8.30 dKH

7.0–11.0 dKH

Calcium

420 ppm

400–550 ppm

Magnesium

1310 ppm

1250–1400 ppm

Salinity

1.025 sg

1.025–1.027 sg

Temperature

78.4 °F

76.0–82.0 °F

8.22

7.8–8.55

Nitrate

8.0 ppm

5.0–50.0 ppm

Phosphate

0.11 ppm

0.06–0.3 ppm

Nitrite

0.00 ppm

0.0–0.2 ppm

Ammonia

0.00 ppm

0.0–0.0 ppm

ORP

340 mV

250–400 mV

Parameter Ranges

Parameter	Target Range	Tolerable Range	Natural Ocean	Unit	Notes
Alkalinity dKH	7.0-11.0	6.0-12.0 dKH	~6.5 dKH	dKH	🧪This is the #1 parameter that kills corals when it swings. Think of it as the skeleton-building ingredient. Dose consistently and test every day if you have SPS.
Calcium Ca²⁺	400-550	370-600 ppm	~420 ppm	ppm	🦴Calcium is literally what coral skeletons are made of. Randy Holmes-Farley's range is 400-550 ppm, and natural seawater sits around 420. Low calcium slows growth; far above the range, the chemistry gets harder to keep balanced.
Magnesium Mg²⁺	1250-1400	1200-1450 ppm	~1280 ppm	ppm	🔗Magnesium is the chemistry glue — it keeps calcium and alkalinity from fighting each other. Low mag = parameters that won't stay stable no matter what you dose.
Salinity	1.025-1.027	1.023-1.028 sg	1.025-1.027	sg	🧂Match the real ocean exactly — 1.025 SG. Your fish evolved for this. Even small swings stress them out. An ATO keeps it rock steady.
Temperature	76.0-82.0	74.0-84.0 °F	variable	°F	🌡️Keep it like a warm beach day — 78°F is the sweet spot. Too cold and fish get sluggish. Too hot and oxygen drops fast.
pH	7.8-8.55	7.6-8.65	8.0-8.3		⚗️The ocean is slightly basic, and your tank should be too. pH naturally drops at night — open a window or run a refugium on a reverse cycle to keep it up.
Nitrate NO₃⁻	5.0-50.0	1.0-100.0 ppm	<0.1 ppm	ppm	🌿A little nitrate is actually good — corals need it as food. Zero is a problem, not a win: it starves corals of color and, when phosphate stays up, invites dinoflagellates. Randy Holmes-Farley lets it float between 5 and 50 ppm, and warns that more problems come from lowering nitrate than from the level itself. Steady beats low.
Phosphate PO₄³⁻	0.06-0.3	0.02-0.5 ppm	~0.005 ppm	ppm	🎨Corals need tiny amounts of phosphate to look colorful. Zero phosphate = pale, stressed corals. Randy Holmes-Farley lets it float between about 0.06 and 0.3 ppm. Above that, bring it down slowly, over weeks, not days.
Nitrite NO₂⁻	0.0-0.2	0.0-0.5 ppm	~0 ppm	ppm	⚠️Nitrite is the middle step in the nitrogen cycle. In saltwater it's far less dangerous than in freshwater — seawater's chloride blocks it at the gill — so treat it as a cycling telltale, not a toxin. A trace reading is usually test-kit noise. A real, sustained rise means your cycle isn't finished or something died.
Ammonia NH₃	0.0-0.0	0.0-0.1 ppm	~0 ppm	ppm	☠️The most dangerous parameter. Even 0.25 ppm can kill fish within hours. Zero always. If you see any ammonia in an established tank, do a water change immediately.
ORP	250-400	200-450 mV	~400 mV	mV	⚡Oxidation reduction potential — a real-time proxy for water cleanliness. Healthy reef tanks sit 250–400 mV; lower hints at organic load building up (skimmer, GAC, water change). Probe drift is common; recalibrate quarterly.

Ranges reflect your settings. Customize in Settings