Common/yellow seahorse
The common or yellow seahorse is a member of the family Syngnathidae found across the Indo-Pacific. It has the classic seahorse form, with a horse-like head, prehensile tail, and an upright posture, ranging in color from yellow and orange to brown and near-black. Seahorses are slow, deliberate swimmers that are peaceful and easily outcompeted for food. They are best kept in a dedicated species tank, in pairs or small groups, away from fast or aggressive fish and stinging invertebrates. They require calm water flow, hitching posts such as macroalgae or artificial holdfasts, and frequent feedings of enriched frozen mysis; many need weaning from live food. As with all seahorses, the male broods the eggs in a belly pouch and gives birth to live young. They demand pristine water and attentive care.
Water parameters
| Temperature | 23 – 27 °C |
|---|---|
| pH | 8.1 – 8.4 |
| Carbonate hardness (KH) | 8 – 12 °dKH |
| Salinity | 33 – 35 SG |
Tank & stocking
| Minimum tank volume | 120 L |
|---|---|
| Volume budget per individual | 50 L — adds up with tank-mates |
| Minimum group size | 2 individuals (shoaling) |
“Minimum tank volume” is a reasonable floor, not an absolute limit. The per-individual budget is used by the Aqua app to estimate how heavily a tank is stocked.
Frequently asked questions
What size aquarium does Common/yellow seahorse need?
Provide at least 120 litres for a small group to keep Common/yellow seahorse in good conditions.
What water parameters does Common/yellow seahorse need?
A temperature of 23–27 °C, pH 8.1–8.4, saltwater.
Is Common/yellow seahorse peaceful or aggressive?
Its temperament is peaceful.
What does Common/yellow seahorse eat?
Its diet: carnivore.
How many Common/yellow seahorse should be kept together?
It is a social species: keep a group of at least 2.
How big does Common/yellow seahorse get?
Around 17 cm as an adult.
Is Common/yellow seahorse suitable for beginners?
Care level: advanced.
Planning a tank with Common/yellow seahorse?
AquaTender turns these parameters into live advice: it checks whether your tank is big enough, how heavily it's stocked, and whether your fish are compatible — then tracks water tests, photos and maintenance for you.
Fish from the same biotope
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