Everything saltwater, in one beautiful place.
A modern hub for marine fish, corals, and reef tanks. A deep species database, no-fluff care guides, tank journals, and ocean science — written for hobbyists, not search engines.
The hub for everything saltwater.
Four things, done well: a database, a learning path, deep guides, and the news that matters to reef-keepers.
Species database
Care needs, tank size, compatibility — for hundreds of fish, corals, and invertebrates.
Browse the database
Start a saltwater tank
The beginner path: cycling your tank, picking your first fish, and avoiding the mistakes everyone makes.
Read the beginner guide
In-depth care guides
Water chemistry, lighting, aquascaping, fish health — written by people who actually keep reefs.
Explore the guides
News & ocean science
Coral bleaching events, new species, conservation, and research that affects the hobby.
Read the latest
Popular this week
A peek at the species database.
Latest guides
All guides →How to cycle a saltwater tank (the right way)
Cycling builds the bacterial colonies that keep fish alive. Done wrong it kills livestock. Here is the patient, no-shortcut version.
Your first saltwater fish: 7 species that won't break your heart
Once your tank is cycled, you need a hardy fish that survives beginner mistakes. These seven species have a track record.
Saltwater vs. freshwater: an honest comparison
Saltwater isn't 'just freshwater with salt added.' Here's what's actually different — cost, livestock, time, and the satisfaction at the end.
News & science
All news →May 5, 2026
Featured reading: "Is Keeping a Saltwater Aquarium Difficult?" — Aqueon
Aqueon makes the case that saltwater is no longer the expert-only hobby it used to be. A balanced primer on what's actually different (cost, patience, water chemistry) versus what's myth (fish size, prior experience requirement).
Apr 28, 2026
Featured reading: "Saltwater Aquarium Tips for Beginners — Don't Fail Year One"
A frank, experience-based punch list from My First Fish Tank: RODI water, twice-weekly testing, a PAR meter, redundant heaters, mesh lids, and the hard-earned lesson that you can only research so much before you have to learn by doing.
Apr 15, 2026
Featured reading: "Culturing Phytoplankton for Reef Aquarium Food"
How to grow your own phyto at home — feed for filter feeders, copepods, and hard-to-keep fish like mandarins. A genuinely useful skill for an intermediate reefer.
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