The fahaka puffer (Tetraodon lineatus) is the largest puffer most aquarists can realistically keep: a 16–18 inch true freshwater predator from the Nile and the river systems of west and central Africa. It is also sold as the Nile puffer, lineatus puffer or globe fish. It is intelligent, interactive, entirely intolerant of tank mates, and it will bite hard enough to cause real injury.
Fahaka Puffer Care at a Glance
| Parameter | Value |
|---|---|
| Scientific name | Tetraodon lineatus |
| Adult size | 16–18 in (40–45 cm) |
| Lifespan | 10–15 years |
| Minimum tank | 125 gal (72×24 in); 180 gal preferred |
| Water type | True freshwater |
| Temperature | 75–82°F (24–28°C) |
| pH | 7.0–8.0 |
| Hardness | 10–20 dGH |
| Tank mates | None — strictly solitary |
Fahaka Puffer Tank Size
One hundred and twenty-five gallons is the working minimum, and the dimensions matter more than the number: you want at least 72 inches long by 24 inches front to back so an 18-inch fish can turn without bending. A 180-gallon or a 6×2×2 foot custom tank is where most long-term fahaka keepers end up.
- Grow-out: a 2-inch juvenile can start in a 40-gallon for six to nine months, then must move. Fahakas add 4–6 inches in their first year.
- Filtration: a sump, or two large canisters. This fish eats whole shellfish and the waste load is closer to a large cichlid pond than an aquarium.
- Water changes: 40–50% weekly, every week.
- Hardscape: sand, heavy smooth rock and large driftwood, all placed so a digging fish cannot bring it down. Nothing sharp — fahakas rub and scrape.
- Heater: guarded or in the sump. Fahakas have broken heaters.
Check dimensions against volume with the tank size calculator.
Why Fahakas Are Kept Alone
A fahaka puffer will eventually kill anything you put with it, including fish far larger than itself. Juveniles sometimes tolerate company for months, which persuades people it will work; the change when it comes is fast and fatal. Plan a single-specimen tank from the start.
Fahaka Puffer Food
- Staples: whole mussels and clams in shell, crayfish, unpeeled prawns, crab legs, cockles, large snails.
- Supplements: chunks of white fish, squid, earthworms.
- Frequency: daily as a small juvenile, every other day through the grow-out, then two to three times a week as an adult. Adult fahakas fed daily become obese.
- Never feeder fish. Thiaminase and disease risk with no benefit.
- Use long tongs. Always.
See the feeding guide and the teeth page — shell-on food is what keeps an 18-inch beak in check.
Behaviour
Fahakas recognise their keeper, follow movement outside the glass, and beg. They also rearrange the tank, dig, and go through moody phases where they hide for a day or two. Colour shifts from bright yellow-and-brown striping to dark and muted with mood and stress — see colour changes. Sudden glass-surfing or refusing food for more than a few days is worth investigating; both are covered on the not eating page.
Health Notes
- Wild-caught. Almost all fahakas are. Quarantine and deworm with praziquantel and metronidazole on arrival.
- Nitrate is the chronic killer. Test weekly; hold under 20 ppm.
- Half-dose medication and avoid copper.
- Scrapes and cuts heal well in clean water but infect quickly in dirty water — another reason for the large weekly change.
Frequently Asked Questions
What size tank does a fahaka puffer need?
125 gallons is the working minimum, with a footprint of at least 72 by 24 inches so an 18 inch fish can turn freely. 180 gallons or a custom 6 by 2 by 2 foot tank is where most long-term keepers end up.
How big does a fahaka puffer get?
16 to 18 inches, reached over three to four years, with 4 to 6 inches of growth in the first year alone. A 2 inch juvenile outgrows a 40 gallon grow-out tank within six to nine months.
Can a fahaka puffer live with other fish?
No. Fahakas are strictly solitary. Juveniles sometimes tolerate tank mates for months, which misleads keepers, but an adult will eventually kill anything sharing its tank, including much larger fish.
What do fahaka puffers eat?
Whole mussels and clams in shell, crayfish, unpeeled prawns, crab legs, cockles and large snails, with white fish, squid and earthworms as supplements. Feed adults two to three times a week and always use long tongs.
Do fahaka puffers need brackish water?
No. Tetraodon lineatus is a true freshwater fish from the Nile and other African river systems. Keep it at pH 7.0 to 8.0 and 10 to 20 dGH with no added salt.
Are fahaka puffers aggressive?
Extremely, toward other fish. Toward their keeper they are curious and interactive but capable of a serious bite, so never hand-feed and never move one with a net, because a netted puffer can gulp air.