About ReefDen
ReefDen is a reference site for saltwater aquarium hobbyists. It exists because reliable, well-organized information about marine fish, corals, and reef tanks is harder to find than it should be — scattered across decade-old forum threads, Facebook groups, and retailer product pages with conflicting advice. We're building the resource we wish existed when we started.
What you'll find here
- A structured species database covering common and uncommon marine fish, corals, and inverts. Each entry includes care difficulty, tank-size guidance, water parameters, reef-compatibility, and photos with proper attribution.
- Cornerstone care guides on cycling, water chemistry, lighting, equipment, quarantine, aquascaping, water changes, and beginner fish picks.
- News & featured reading — curated articles on aquaculture, reef science, and hobby practice.
- Coming next: tank journals, a community forum, and member tools for tracking your own reef.
How content is created
Species taxonomy and common-name data come from WoRMS (the World Register of Marine Species). Photos are sourced from iNaturalist research-grade observations and Wikimedia Commons, using only Creative Commons licenses that permit commercial use (CC-BY, CC-BY-SA, CC0, public domain). Every photo carries attribution to the original photographer.
Cornerstone care guides reflect mainstream hobby consensus and published reefkeeping references. They are continuously edited as we learn more from the community. Care fields for individual species are filled in over time; entries that haven't been editor-reviewed yet display a "Care info pending" badge so you know what's vetted and what isn't.
How we're funded
Through affiliate links to saltwater retailers (the same ones we shop at ourselves) and a free newsletter. We don't take payment to feature products or shape recommendations. If a DIY or no-cost option is the right answer, that's what we say. See our affiliate disclosure for full details.
Get in touch
Editorial corrections, partnership inquiries, and reader questions are all welcome. See the contact page.