Hard Shell Porcupine Pufferfish (Diodon holocanthus)
Reef compatible – No
Care level – Intermediate
Disposition – Semi-aggressive
Min. tank size – 75 gallons
Mature size – 20 inches
Specifications
| Feature | Value |
|---|---|
| Species | Diodon holocanthus |
| Size (Adult) | 20 inches |
| Minimum Tank Size | 75 gallons |
| Compatibility | Reef compatible: No |
| Aggression Level | Semi-aggressive |
| Difficulty Level | Intermediate |
FAQ
Is the porcupine pufferfish safe to keep with corals?
No, this species is not reef compatible and may damage coral structures.
What is the expected adult size of this fish?
The mature size of the Hard Shell Porcupine Pufferfish is approximately 20 inches.
What is the recommended tank size for this fish?
A minimum tank size of 75 gallons is required.

Natalie Edmunds –
Got this fish for my 100-gallon tank. It’s active and stays in the back corner. I’ve noticed it doesn’t eat much, so I feed it twice a week. It’s not aggressive toward other fish, but it does defend its space. Good for intermediate reef setups with no corals.
Vanessa Langdon –
The fish arrived healthy and looks well-maintained. It’s a bit shy at first but settles into the tank after a week. I keep it with a few larger fish, and it doesn’t seem to attack them. Tank size is adequate, and it’s a solid choice for intermediate aquarists.
Rebecca Grant –
It’s not the most active fish, but it’s peaceful in its own space. I didn’t expect it to grow that large, but it’s now about 12 inches. Feeding is simple, and it doesn’t cause issues with tank mates. Just make sure the tank is big enough.