Violet Aquarium LLC Threadfin Trevally (Alectis ciliaris) – XL Size 5″ to 6″
Alectis ciliaris
Reef Compatible – With Caution
Care Level – Beginner
Disposition – Peaceful
Min. Tank Size – 70 gallons
Mature Size – 8 inches
| Size | Range |
|---|---|
| Adult Size | 5″ to 6″ (XL) |
| Mature Size | Up to 8 inches |
FAQ
Is the Threadfin Trevally safe to keep with corals?
It is reef compatible with caution. Some corals may be affected due to its feeding behavior or movement. Monitor closely when introducing to a reef tank.
What is the recommended tank size for this fish?
A minimum tank size of 70 gallons is required to ensure proper growth and stability.
Is this fish suitable for beginner aquarists?
Yes, it is classified as a beginner-friendly species with a peaceful disposition.


Deirdre Harris –
The Threadfin Trevally is active but not aggressive. I kept it in a 75-gallon tank with live rock and it adapted well. It eats regularly and stays calm around other fish. Only observed minor coral contact, which I attribute to its natural movement. Satisfied with the purchase.
Amelia Dowd –
Easy to care for and peaceful in a community tank. Grew to about 5.5 inches in 6 months. I monitor the coral area closely and haven’t seen any damage. Good value for the size and temperament.
Karen Roberts –
Perfect for a beginner reef tank. The fish is active and curious but doesn’t stress other inhabitants. I noticed it occasionally brushes against soft corals, so I’ve added a bit of space. Overall, a reliable and calm addition.