AquariumStocking

What Size Tank Do Neon Tetras Need?

Adult standard length 1.2 inches. Buy a mixed-sex group of at least 8-10, in a 24 × 12 inch base of about 14 US gallons.

Full breakdown: how many fish per gallon. Full breakdown: how many fish in a 20 gallon tank.

Quick answer: Neon tetras (Paracheirodon innesi) need a minimum base of 24 × 12 inches, about 14 US gallons, and Seriously Fish says to buy a mixed-sex group of at least 8-10. Adult standard length is 1.2 inches, the temperature range is 70-77°F, and the profile's heater is 50 watts. The filter rating is 215-270 liters per hour, which converts to 56.80-71.33 gallons per hour; Aqueon puts about 14 gallons on the 50 watt band (5-20 gallons) and not on the 100 watt band, which starts at 15.

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The figures

FigureValueSource
Adult standard length1.2 inSeriously Fish
Minimum aquarium base24 × 12 inSeriously Fish
Approximate volume14 US gallonsSeriously Fish
Group / socialBuy a mixed-sex group of at least 8-10Seriously Fish
Filter rating215-270 liters per hourSeriously Fish
Filter rating in gallons per hour56.80-71.33 gphCalculated from the published liters per hour ÷ 3.785 (Seriously Fish; 1 US gallon = 3.785 liters)
Temperature70-77°FSeriously Fish
Heater on the profile50 watts, assuming a room around 68°FSeriously Fish
Aqueon band that contains about 14 gallons50 watts for 5-20 gallonsAqueon
Aqueon 100 watt band15-40 gallons (14 is below 15)Aqueon

Full breakdown: what size filter for a 20 gallon tank.

How to size it

Convert the published filter first. Seriously Fish rates it at 215-270 liters per hour, and 1 US gallon = 3.785 liters.

215 ÷ 3.785 = 56.80 gph. 270 ÷ 3.785 = 71.33 gph.

Check that against the source's ordinary turnover, four to five times tank volume per hour. Four times about 14 gallons is 56 gallons per hour, and five times is 70. The converted rating, 56.80-71.33 gph, lands on that same band, so a filter sold around 56.80-71.33 gph matches both the printed liters-per-hour box and the four-to-five rule. This species is not marked for gentle flow, unlike a betta.

The group is part of the size. A base that is only wide enough for one or two fish misses the published instruction to buy at least 8-10 mixed-sex fish. The 24 inch length is the figure that gives that group a line to swim; the 1.2 inch adult length is the body size, not the tank length.

Heat is narrow and the two charts agree on watts. The profile wants 70-77°F and a 50 watt heater, assuming a room around 68°F. Aqueon lists 50 watts for 5-20 gallons, and about 14 sits inside that span. It sits just under 15, so the 100 watt band (15-40 gallons) does not include this minimum.

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Accessory: the 50 watt heater both the species profile and the Aqueon 5-20 gallon band name for this volume. Shop a 50 watt aquarium heater on Amazon

Related pages

FAQ

What size tank do neon tetras need?

Seriously Fish lists a minimum base of 24 × 12 inches, about 14 US gallons, for Paracheirodon innesi, and says to buy a mixed-sex group of at least 8-10. Adult standard length is 1.2 inches.

What filter rating matches that neon tetra minimum?

Seriously Fish lists 215-270 liters per hour. Dividing by 3.785 gives 56.80-71.33 gallons per hour. Four times about 14 gallons is 56 gallons per hour, and five times is 70.

What temperature and heater wattage do neon tetras need?

Seriously Fish lists 70-77°F and a 50 watt heater, assuming a room around 68°F. Aqueon's 50 watt band covers 5-20 gallons, which includes about 14 gallons. The 100 watt band starts at 15 gallons.

Do neon tetras fit a published minimum under 20 gallons?

Yes. The Seriously Fish volume is about 14 US gallons, which is under about 21 gallons and inside Aqueon's 5-20 gallon band for a 50 watt heater.

Sources