Reef Tank Statistics
Original numbers from real reef tanks. ReefBay users log their tanks, livestock, water tests and maintenance in the app. These pages aggregate that data, with the method next to every number. Free to cite with a link.
What size reef tank do most people have?
Real reef tank size statistics from thousands of ReefBay tank profiles: the median size, the most common sizes, how many reefers run nano tanks and how many use a sump.
Sample: 11,506 tanks · Updated Nov 2, 2026
What are the most popular saltwater fish in reef tanks?
The most popular saltwater fish, ranked by how many real reef tanks keep them. Data from thousands of ReefBay tank profiles, with nano and large tank rankings.
Sample: 6,072 tanks · Updated Nov 2, 2026
What are the most popular corals in reef tanks?
The most popular corals, ranked by how many real reef tanks keep them. Data from thousands of ReefBay tank profiles, with nano and large tank rankings.
Sample: 4,458 tanks · Updated Nov 2, 2026
What are the most popular invertebrates in reef tanks?
The most popular clean-up crew and invertebrates, ranked by how many real reef tanks keep them. Data from thousands of ReefBay tank profiles.
Sample: 4,433 tanks · Updated Nov 2, 2026
What are normal water parameters in a real reef tank?
What reef tanks actually run, from hundreds of thousands of logged readings: median and typical range for alkalinity, calcium, magnesium, nitrate, phosphate, salinity, temperature and pH.
Sample: 5,947 tanks · Updated Nov 2, 2026
What lighting, salt and dosing brands do reefers use most?
The most used reef lighting, salt mix, dosing and food brands, ranked by how many real reef tanks list them in the ReefBay app.
Sample: 4,588 tanks · Updated Nov 2, 2026
How often do reefers do water changes and test their water?
Real maintenance habits from thousands of reef tank reminders and logged tests: median water change interval, how often reefers test alkalinity and nitrate, and the most tracked parameters.
Sample: 2,025 tanks · Updated Nov 2, 2026
How healthy is the average reef tank?
Average reef tank health scores from thousands of DeepDive tank analyses: overall score, the weakest category for most tanks, and how nano tanks compare to large tanks.
Sample: 1,329 tanks · Updated Nov 2, 2026
About this data
ReefBay is a free reef aquarium app for iOS and Android. Reefers use it to keep a tank profile, log livestock, track water parameters and set maintenance reminders. The statistics on these pages are computed from that data every week. Test accounts, staff accounts and deleted tanks are excluded. Each page explains exactly what was counted.
You may reuse any number or chart with a link to the page it came from. For a custom cut of the data, email [email protected].
