Skip to content
Fish Saltwater Care: medium Peaceful

Longsnout Seahorse

Hippocampus reidi
— No votes yet Rate it
Other names: Slender seahorse, Brazilian seahorse, Reidi
Group: Marine fish · Family: Syngnathidae · Origin: Western Atlantic — from North Carolina to Brazil, the Caribbean and the Gulf of Mexico

An elegant Atlantic seahorse with a slender body, a long snout and vivid colors ranging from yellow to red. Captive-bred specimens are available; it needs a separate aquarium with gentle flow and is listed in CITES Appendix II.

Will it suit my tank?

Last updated October 16, 2026

Temperature
22–26°C
pH
8.1–8.4
Adult size
17 cm
Minimum tank size
120 liters
Social structure
Pair
Group
at least 2
Male–female ratio
1 erkek : 1 dişi
Swimming zone
Middle
Diet
Carnivore
Breeding
Other

Water parameters

Temperature22–26°C
pH8.1–8.4
Recommended range
Considered reef safe

Overview

October 16, 2026 · Suggest an edit

The longsnout seahorse is recognized by its slender build and a snout that is long compared with other seahorses. It comes in very different colors such as yellow, orange, red, brown and black; its body usually has small dark dots and light-colored patches. Aquarium-bred specimens are available; only captive-bred specimens used to frozen food should be chosen. Legal note: All seahorses are listed in CITES Appendix II; the native seahorses of the Mediterranean are protected and must not be collected from the wild.

Tank Setup

October 16, 2026 · Suggest an edit
  • At least 120 liters and at least 50 cm of depth for a pair; a tall aquarium.
  • Salinity specific gravity 1.023–1.025, pH 8.1–8.4, temperature 22–26°C.
  • Gentle, diffuse flow; pump and filter intakes must be covered.
  • Plenty of hitching posts; no anemones or stinging corals.

Diet

October 16, 2026 · Suggest an edit

Carnivorous. Enriched frozen mysis 2–3 times a day; occasionally enriched live brine shrimp and copepods. Since it eats slowly, place the food right in front of it or in a feeding dish.

Behavior and Compatibility

October 16, 2026 · Suggest an edit

Peaceful, slow and skittish. It can change color according to its surroundings and mood. The male carries the eggs in the brood pouch on his belly.

Good companions: Other seahorses (from the same source), small calm gobies, cardinalfish, nerite and Cerith snails.

Avoid: Fast-eating fish, pufferfish and triggerfish, crabs, anemones and stinging corals.

A short profile for this species

The Longsnout Seahorse page has the basics, but the sections below have not been written yet. If you keep this species, write a section from your own experience; it will be published under your name after editor approval.

Tank mates

This list is calculated automatically from the species profile and grows as new species are added to the catalog. Try it in the planner for a definite answer.

Should not be kept together

Hobbyist notes

0 notes

Things you won't find in books, learned by trial and error. The most helpful ones are on top.

No notes yet. If you have experience with this species, leave the first note.
Change history and contributors
  1. Page created · October 16, 2026