Seahorses: Incredible Animals, Not Reef Tank Fish
Seahorses are bony fish (not invertebrates), in the same group as pipefish. They're some of the most magical animals available in the marine hobby, but they need a dedicated system. A standard reef tank is not suitable.
Why Standard Reef Tanks Don't Work
Flow — Corals want 20–50x turnover. Seahorses are poor swimmers and high flow exhausts them. Temperature — Captive-bred seahorses do best at 22–24°C, lower than the typical 25–26°C reef. Warmer water increases bacterial infection risk. Feeding — Seahorses ambush tiny prey in slow motion. Faster tankmates will outcompete them. Aggression — Most reef fish will bully seahorses.
Seahorse Tank Basics
- Temperature: 22–24°C (a chiller may be needed)
- Flow: Gentle. Sponge filters work well
- Hitching posts: Gorgonians, artificial corals, macroalgae, branching rock
- Tankmates: Pipefish, dragonets, small peaceful gobies only
- Tank size: 120 litres minimum for a pair, taller tanks preferred
Captive-Bred Only
Wild-caught seahorses carry parasites, won't eat frozen food without training, and are CITES Appendix II listed. Captive-bred specimens eat frozen Mysis from day one and are parasite-free.
Feeding
Seahorses need 30–50+ Mysis shrimp per day, target-fed with a pipette or turkey baster, across two to three daily sessions. A fixed feeding station helps monitor intake.
Species for UK Keepers
- Lined seahorse — the recommended starter species
- Longsnout seahorse — larger, slightly more demanding
- Yellow seahorse — common, but verify it's genuinely captive-bred
Always keep at least a pair. Solitary seahorses often decline.
What species are other UK seahorse keepers finding success with?
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