Demo Reef Charts

Combined Parameter Trends · 15 Days

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 Schedule

↓ CSV

Weekly

▢Check salinity & temperature

▢Top off RO/DI reservoir if needed

▢Rinse or replace filter socks

▢Empty protein skimmer cup

▢Test Ammonia, Nitrite, Nitrate, Alk

▢Wipe front glass (magnetic scraper)

Bi-Weekly

▢10–15% water change

▢Clean skimmer neck

▢Check return pump flow

Monthly

▢Clean powerheads & circulation pumps

▢Rinse filter media (in old saltwater)

▢Check RO/DI TDS — replace if >2 ppm

▢Inspect fittings for salt creep

▢Trim chaeto in refugium if overgrown

Every 3–6 Months

▢Replace RO membrane & DI resin

▢Deep clean skimmer body

▢Check & calibrate heater

▢Inspect overflow & drain lines

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