ReefBay data · Reef tank health scores
How healthy is the average reef tank?
Updated November 2, 2026 · Sample: 1,329 tanks · Recomputed weekly
DeepDive, the AI tank analysis in ReefBay, scores a tank from 0 to 100 on water parameters, stability, stocking, compatibility, biodiversity and maintenance. This page aggregates the latest analysis of every analyzed tank.
Key findings
The average reef tank scores 75.3 out of 100 in DeepDive tank analysis (median 76, 1,329 tanks). 41.9% of tanks score 80 or higher.
Reef tanks score highest on Water parameters (78.6 average) and lowest on Biodiversity (n/a average).
Stocking level is the lowest-scoring category for 46.3% of reef tanks, more than any other category.
Nano tanks (30 gallons or less) average 73.6 overall, mid-size tanks average 76.4 and tanks of more than 100 gallons average 75.6.
Average score by category
Mean score out of 100 across the latest analysis of 1,329 tanks (4,461 analyses run in total).
- Overall 75.3 (median 76)
- Water parameters 78.6 (median 76)
- Stability 68.8 (median 74)
- Stocking level 58.5 (median 67)
- Compatibility 72.9 (median 70)
- Biodiversity n/a (median n/a)
- Maintenance 74.5 (median 80)
Overall score distribution
Share of tanks by overall score. 41.9% score 80 or higher.
- Under 50 3.7% (49)
- 50 to 59 5.4% (72)
- 60 to 69 20% (269)
- 70 to 79 29% (382)
- 80 to 89 31% (411)
- 90 to 100 11% (146)
The weakest category per tank
For each tank, the category with the lowest score. Share of tanks where that category is the weakest.
- Stocking level 46% (615)
- Compatibility 27% (357)
- Stability 12% (164)
- Maintenance 7.4% (99)
- Water parameters 7.1% (94)
Overall score by tank size
- Nano (30 gallons or less) 73.6 (501)
- Mid (31 to 100 gallons) 76.4 (620)
- Large (more than 100 gallons) 75.6 (194)
Method
- Source: tank profiles and logs created by ReefBay app users. ReefBay is a reef aquarium app for iOS and Android.
- Excluded: deleted tanks, deleted accounts, ReefBay staff and test accounts.
- Counted: the latest DeepDive tank analysis per tank, with a valid overall score (1 to 100).
- DeepDive scores are generated by an AI model from the tank profile, livestock, logged parameters and maintenance history. They are an assessment, not a measurement.
Cite this page
You may reuse these numbers and charts with a link to this page (CC BY 4.0). Suggested citation:
ReefBay. "How healthy is the average reef tank?" November 2026. https://reefbay.com/stats/tank-health-scores
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ReefBay is a reef aquarium app. Keep a tank profile, log your livestock and water tests, set maintenance reminders and identify fish and coral from a photo. Every logged tank makes these statistics better.
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