Pterois radiata – Radiata Lionfish
Reef Compatible – With Caution
Care Level – Intermediate
Disposition – Semi-aggressive
Min. Tank Size – 30 gallons
Mature Size – 8 inches
| Size | Range |
|---|---|
| Adult Size | 3″ to 4″ (ML) |
FAQ
Is the Radiata Lionfish safe to keep with other reef fish?
It is reef compatible with caution. It may attack smaller or slower-moving fish, so it should not be kept with very small or delicate species.
What is the recommended tank size for this fish?
A minimum tank size of 30 gallons is required to provide adequate space and stability.
How long does it take for the Radiata Lionfish to reach maturity?
The fish typically reaches a mature size of 8 inches over several months, depending on water conditions and diet.

Jacob Ince –
I’ve kept the Radiata Lionfish for six months now. It’s active and interesting to watch. I’ve placed it in a 40-gallon tank with some corals, and it hasn’t damaged any of them. Just make sure to keep it away from small fish like gobies or shrimp.
Penelope Newman –
The fish is semi-aggressive as described. I noticed it flicks its tail when startled, but it doesn’t attack other fish regularly. I’m happy with the size and coloration. Tank needs to be at least 30 gallons to feel comfortable.
Lucas Dyer –
It’s a unique addition to my reef tank. I had to be careful with the placement of smaller fish. It’s not aggressive, but it does chase small fry. Overall, it’s a good choice for intermediate aquarists.