Start here · Essential guide
Saltwater Fish Care for Beginners
A beginner's guide to saltwater fish care: equipment, water parameters, cycling, first fish, quarantine, feeding and routine maintenance for a marine aquarium.
Saltwater & Reef
Reef & Saltwater Care
Reef-safe fish, compatibility and treating marine disease.
Best Algae-Eating Saltwater Fish
The best algae-eating saltwater fish for reef and marine tanks, including tangs, rabbitfish and blennies, plus what eats hair algae and which snails help.
Best Goby for a Reef Tank
Compare the best gobies for a reef tank, from watchman gobies and pistol shrimp pairs to sand sifters and nano species, with tank size and care tips.
Best Saltwater Community Fish
The best saltwater community fish for peaceful marine tanks: top picks, species to be careful with, stocking levels, feeding tips and where to buy livestock.
Compatible Reef Fish
How to choose compatible reef fish: which species tend to live peacefully together, which combinations cause trouble, and how to introduce fish in a sensible order.
Copper Treatment for Marine Fish
How copper treatment for marine fish works: what it treats, safety concerns, therapeutic levels, testing, how long to treat, and aftercare in a hospital tank.
Ick on Saltwater Fish
Learn to recognize ick on saltwater fish, how the parasite's life cycle works, treatment options, and whether fish can recover and the disease can go away.
Reef Safe Saltwater Fish
Which saltwater fish are generally reef safe, which carry risk, and how to lower the chance of damage to corals and invertebrates when stocking a reef tank.
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