Red Pencil Sea Urchin Heterocentrotus Mammillatus

£29.99

SKU: STF-MARINE-MISSING-CRITTERS-231 Category:

Description

Red Pencil Sea Urchin – Heterocentrotus mammillatus

Overview:
The Red Pencil Sea Urchin is a striking and unique urchin, instantly recognizable by its thick, bright red spines resembling pencils. More ornamental than functional, it adds a bold splash of color and texture to aquariums.

Origin:
Native to the Indo-Pacific, often found in rocky reef areas exposed to strong surge zones.


Feeding:

  • Feeds on algae, biofilm, and detritus.

  • Supplement diet with dried seaweed, algae wafers, or fresh macroalgae if natural algae growth is limited.


Tank Mates:

  • Reef-safe, but its size and strength mean it can dislodge corals or rockwork.

  • Avoid with predatory fish such as puffers and triggers.


Aggression Level:
Peaceful. Will not bother tank mates but may inadvertently shift décor while moving.


Experience Level:
Intermediate. Requires stable, well-established aquariums with ample algae and strong rockwork.


Water Parameters:

  • Temperature: 72–78°F (22–26°C)

  • pH: 8.1–8.4

  • Salinity: 1.023–1.025

  • Tank Size: 75+ gallons


Unique Features:

  • Iconic thick red spines for a dramatic display.

  • Long-lived and hardy in stable reef systems.

  • Excellent at helping control algae, though slower than other urchins.


✨ The Red Pencil Sea Urchin is both a conversation piece and functional grazer, perfect for large, established reef tanks.

Sims Tropical Fish Livestock Guarantee & Delivery Policy

We do not offer refunds for livestock that arrive deceased (DOA) or for any losses that occur within the seven-day guarantee period.

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Collection Address:

You will receive delivery or collection date confirmation by email within 24 hours of purchase.

Can I change my delivery or collection date?

We manage and operate the logistics and distribution of aquatic livestock across the UK for both trade and retail customers

All sizes listed on our website are approximate, as livestock is seasonal and naturally variable