Seahorse Aquarium Guide: How to Keep Seahorses in Saltwater
How to set up a seahorse aquarium: species, tank size, temperature, feeding, tankmates, disease, CITES and UK law for keeping captive-bred seahorses.
Fish & Invertebrate Guides
Species and care guides for marine fish and invertebrates: tangs, angelfish, seahorses, hermit crabs and feeding.
Reef-Safe Angelfish: Best Dwarf Angelfish for Your Reef Tank
Which angelfish are reef safe: dwarf and swallowtail angelfish rated by risk to SPS, LPS, zoanthids and clams, with tank sizes and anti-nipping tips.
Saltwater Angelfish: Types, Tank Size & How to Choose
The main types of saltwater angelfish compared by size, tank volume and reef risk, with tips on choosing, feeding and keeping them.
Best Tangs for a Reef Tank: Yellow, Kole, Tomini & More
Which tang suits your reef tank: top picks by tank size, how to mix tangs, captive-bred yellow and blue tangs in 2026, and quarantine advice.
Tang Fish (Surgeonfish): Types, Care & Tank Size Guide
What tang fish (surgeonfish) are, the main genera, 19 popular species compared by size and tank volume, plus diet, ich and aggression advice.
Reef-Safe Hermit Crabs: Best Saltwater Species (Picture Guide)
The best reef-safe saltwater hermit crabs, how to identify them by colour, which to avoid, how many to add and how to stop them killing snails.
How Often to Feed Saltwater Fish (and How Much)
Most saltwater fish need feeding once or twice a day. Feeding guide by fish group, portion sizes, best foods, overfeeding signs and holiday feeding.