What is a 75 gallon tank good for?
The 75 gallon is a 55 that is five inches deeper front to back. That extra width changes everything: big fish can turn, rockwork can stand safely, and plants have room. If you have space for a 55, try to stretch to a 75.
How much water does it really hold?
The label says 75 gallons (284 liters). That is the tank filled to the very brim, measured from outside the glass. In real life the glass, the gap at the top, the gravel and the decor take up room. A set-up 75 gallon tank holds about 64 gallons (241 liters). Use that smaller number when you dose medicine or water conditioner. Work out your exact water volume
How much does a 75 gallon tank weigh?
An empty glass 75 gallon tank weighs about 100 lb (45 kg). Filled, with gravel and a few rocks, it weighs about 755 lb (345 kg). That is as much as a grand piano, so use a stand made for aquariums, not ordinary furniture. The load on the floor under the tank is about 126 lb per square foot (620 kg/m²). Add your own stand and rocks
What size heater does it need?
The colder your room, the bigger the heater. These sizes hold the water at 78 °F (25.5 °C), right for most tropical fish.
| Your room | Heater to buy |
|---|---|
| Warm room, 73 °F (23 °C) | 2 × 75 W |
| Normal room, 68 °F (20 °C) | 2 × 150 W |
| Cold room, 63 °F (17 °C) | 2 × 200 W |
Check your own room and target temperature
What size filter does it need?
For a community tank, look for a filter rated at 250–380 GPH (950–1,450 L/h). That moves all the water through the filter four to six times an hour. Goldfish and big cichlids need more. Size a filter for your kind of tank
How much gravel or sand?
| Depth | Gravel | Sand |
|---|---|---|
| 1 in (2.5 cm) | 47 lb21 kg | 50 lb23 kg |
| 2 in (5 cm) | 93 lb42 kg | 99 lb45 kg |
| 3 in (7.5 cm) | 139 lb63 kg | 148 lb67 kg |
Two inches suits most tanks. Rooted plants like three. Work it out in bags
How much water to change
A normal weekly water change is a quarter of the water: about 15.9 gallons (60 liters) for this tank. A big clean-up change is half: about 32 gallons (121 liters). Plan changes from your nitrate reading
How many fish can go in a 75 gallon tank?
It depends on which fish. The table shows how many of each the tank carries comfortably if that fish is the only kind in the tank. If you mix kinds, keep fewer of each.
| Fish | How many | Keep at least |
|---|---|---|
| Neon tetra | 60 or more | 6 |
| Guppy | up to 34 | 3 |
| Bronze corydoras | up to 26 | 6 |
| Molly | up to 13 | 3 |
| Tiger barb | up to 24 | 8 |
| Yellow lab | up to 13 | 4 |
| Angelfish | up to 2 | 1 |
| Boeseman's rainbowfish | up to 10 | 6 |
| Discus | 5 | 5 |
| Oscar | 1 | 1 |
Stocking ideas that work
One oscar: 1 oscar. Stocking level 88%. One adult oscar fills a 75-gallon tank by itself. Use heavy filtration and change half the water every week.
Large rainbow community: 6 Boeseman's rainbowfish, 8 bronze corydoras, 1 bristlenose pleco. Stocking level 89%. Boeseman's rainbowfish need the length and show their best color in a group.
Fancy goldfish: 3 fancy goldfish. Stocking level 66%. Three fancy goldfish with room to grow. No heater is needed in a normal room, but filtration must be strong.
Build your own fish list for this tank
Fish that need a bigger tank
These fish are often sold for tanks this size, but they outgrow it:
- Common pleco: grows to 16 in (40 cm) and needs at least 150 gallons (570 liters).
- Bala shark: grows to 14 in (35 cm) and needs at least 150 gallons (570 liters).
- Clown loach: grows to 12 in (30 cm) and needs at least 150 gallons (570 liters).
Questions and answers
What are the dimensions of a 75 gallon tank?
A standard 75 gallon glass tank is 48 × 18 × 21 inches (122 × 46 × 53 cm), measured on the outside as length × width × height. Brands differ by up to half an inch.
How much does a 75 gallon tank weigh?
Empty, about 100 lb (45 kg). Filled with water, gravel and rocks, about 755 lb (345 kg). Add the weight of the stand to find the load on your floor.
What size heater does a 75 gallon tank need?
In a normal room at 68 °F (20 °C), 2 × 150 W holds 78 °F (25.5 °C). In a cold room use 2 × 200 W; in a warm room 2 × 75 W is enough.
How many fish can I put in a 75 gallon tank?
It depends on the fish, not just the gallons. As the only kind in the tank, a 75 gallon tank carries about 60 or more neon tetras, or 34 guppies, or 26 bronze corydoras. Mixed tanks hold fewer of each.
How many liters is a 75 gallon tank?
75 US gallons is 284 liters. Once set up with gravel and decor, the tank holds about 241 liters (64 gallons) of water.
Other tank sizes
Dimensions are the common North American and European standard sizes; brands differ slightly. Weights assume standard glass of typical thickness, 4 cm of gravel and light rockwork. How we calculate