Alectis ciliaris – Threadfin Trevally
Reef Compatible – With Caution
Care Level – Beginner
Disposition – Peaceful
Min. Tank Size – 70 gallons
Mature Size – 8 inches
Specifications
| Feature | Size: M (3″ to 4″) |
|---|---|
| Species | Alectis ciliaris |
| Compatibility | Reef compatible with caution |
| Recommended Tank Size | Minimum 70 gallons |
| Mature Size | 8 inches |
FAQ
Is the Threadfin Trevally safe to keep with corals?
It is reef compatible with caution. Monitor closely for any signs of aggression or coral damage.
What is the expected growth rate of this fish?
The fish grows to a mature size of 8 inches. Growth rate may vary based on tank conditions and diet.
Is this fish suitable for a beginner aquarist?
Yes, it is classified as a beginner-friendly species with a peaceful disposition.


Anthony Sutherland –
Easy to set up and very peaceful in my 75-gallon tank. I’ve kept it for six months and it hasn’t shown any aggression. The fish is active but not too demanding. Only need to watch for coral interactions, which is manageable with regular checks.
Maria Payne –
Grew nicely in my tank over three months. It’s calm and doesn’t chase other fish. I noticed it occasionally nips at soft corals, so I’ve moved them slightly away. Overall, a good choice for a beginner reef tank.
Kevin Murray –
Perfect for a small reef setup. The fish is healthy, stays in one area, and doesn’t stress other inhabitants. I appreciate the beginner-friendly care level and the clear size guidance.