ReefDiary Data
State of Reefing
A citable, anonymized snapshot of how reef and aquarium keepers use ReefDiary to log parameters and maintenance — without exposing individual users or tank identities.
Data as of
Headline statistics
Personal tanks tracked
45
Parameter readings logged
639
Reef-type tank share
89%
Median parameters (reef tanks, 90 days)
| Parameter | Median | Sample size |
|---|---|---|
| alkalinity | 8.9 dKH | 59 readings |
| calcium | 447.5 ppm | 16 readings |
| magnesium | 1405 ppm | 16 readings |
| nitrate | 6.5 ppm | 29 readings |
| pH | 8.15 | 15 readings |
| salinity | 34 ppt | 28 readings |
| temperature | 25.2 °C | 16 readings |
Citable summary
- ReefDiary tracks 45 personal aquariums with 639 logged parameter readings.
- 89% of tracked personal tanks are reef-type systems.
- Median alkalinity among reef tanks (90-day window): 8.9 dKH.
- Median calcium among reef tanks (90-day window): 447.5 ppm.
- Median magnesium among reef tanks (90-day window): 1405 ppm.
- Median nitrate among reef tanks (90-day window): 6.5 ppm.
- Median pH among reef tanks (90-day window): 8.15.
- Median salinity among reef tanks (90-day window): 34 ppt.
- Median temperature among reef tanks (90-day window): 25.2 °C.
Methodology
Aggregated from anonymized personal aquarium data in ReefDiary. Shop and enterprise fleet tanks are excluded. Parameter medians use reef-type tanks only, rolling 90 days, and are published only when at least 10 readings exist. No individual users or tank names are included.