Reference image. Select a frag to view the exact piece.
Signature frags
Dark Knight
Acropora tenuis
£55.00
A navy-blue backdrop with brighter secrets. Rainbow polyps and warmer corallite detail give Dark Knight depth beyond its first impression.
The lighting, flow and placement advice here is specific to this coral. For broader care advice for its species or group, see the linked care guide.
- Lighting
- Low–moderate Acropora light intensity, 200–350 PAR
- Flow
- good turbulent flow
- Lighting
- colour strongly influenced by light/nutrition
- Care advice
- dislikes instability.
Water parameters
These basic parameters follow the linked care guide. Maintain stable conditions within the recommended ranges.
- Temperature
- 24–26°C
- Salinity
- 34–36 PPT / approx. 1.025–1.027 SG
- pH
- 8.0–8.4
- Alkalinity
- 7.0–8.5 dKH
- Calcium
- 400–460 ppm
- Magnesium
- 1200–1380 ppm
- Nitrate
- 5–20 ppm
- Phosphate
- 0.04–0.10 ppm
Every Signature Frags coral goes through an extensive in-house aquaculture process before sale. This includes strict quarantine, treatment throughout the process, and regrowth through multiple systems before entering final grow-out. This conditioning helps prepare our corals for life in your reef.
Your delivery
Choose your arrival day
Carefully packed corals. Select your arrival day before checkout. We schedule dispatch using a tracked next-day courier service across the UK.
Ready to receive
Please ensure someone is available to receive your delivery. Courier delays can occasionally occur.
Coral welfare comes first
If temperatures are unsuitable or there are known courier-network delays or other transport disruptions, we may postpone dispatch. We will contact you to arrange another suitable arrival day.
24-hour coral guarantee
Covered for 24 hours
Corals that arrive dead or die within 24 hours of delivery are covered, subject to our care conditions. Report any concern within that 24-hour window.
Reporting a concern
Send your order number and clear, sharply focused photographs in neutral white lighting, showing the whole coral and a close-up. We may request clearer images or a short video if the evidence is inconclusive.
If a bag arrives cloudy
Photograph it before opening where possible and contact us promptly. If the coral is alive, follow our acclimation instructions without delay. Do not keep it sealed while waiting for our reply.
Guarantee conditions
Approved claims receive a replacement where available, or livestock credit for the amount paid. Replacement shipping is charged separately under our voluntary guarantee.
Follow our care instructions and keep corals on their plugs without mounting them to rockwork during the guarantee period and, if you report a claim, until it has been assessed. Losses caused by inappropriate chemicals, incorrect dipping concentration or duration, or other mishandling are excluded.
See the full policy for claim and care conditions. This guarantee is additional to, and does not affect, your statutory rights.