What is a 210 gallon tank good for?
The 210 gallon is a 180 with four more inches of height. It is a showpiece tank. Plan the floor, the route through the house, the filtration and the water changes before the tank arrives.
How much water does it really hold?
The label says 210 gallons (795 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 210 gallon tank holds about 179 gallons (676 liters). Use that smaller number when you dose medicine or water conditioner. Work out your exact water volume
How much does a 210 gallon tank weigh?
An empty glass 210 gallon tank weighs about 305 lb (140 kg). Filled, with gravel and a few rocks, it weighs about 2,080 lb (945 kg). That is more than a small car, so use a stand made for aquariums, not ordinary furniture. The load on the floor under the tank is about 173 lb per square foot (850 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 × 150 W |
| Normal room, 68 °F (20 °C) | 2 × 300 W |
| Cold room, 63 °F (17 °C) | 2 × 500 W |
Check your own room and target temperature
What size filter does it need?
For a community tank, look for a filter rated at 710–1,070 GPH (2,700–4,050 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) | 93 lb42 kg | 99 lb45 kg |
| 2 in (5 cm) | 185 lb84 kg | 197 lb90 kg |
| 3 in (7.5 cm) | 277 lb126 kg | 295 lb134 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 45 gallons (169 liters) for this tank. A big clean-up change is half: about 89 gallons (338 liters). Plan changes from your nitrate reading
How many fish can go in a 210 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 | 60 or more | 3 |
| Bronze corydoras | 60 or more | 6 |
| Molly | up to 36 | 3 |
| Tiger barb | 60 or more | 8 |
| Yellow lab | up to 36 | 4 |
| Angelfish | up to 7 | 1 |
| Boeseman's rainbowfish | up to 30 | 6 |
| Discus | up to 14 | 5 |
| Oscar | up to 2 | 1 |
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:
- 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 210 gallon tank?
A standard 210 gallon glass tank is 72 × 24 × 29 inches (183 × 61 × 74 cm), measured on the outside as length × width × height. Brands differ by up to half an inch.
How much does a 210 gallon tank weigh?
Empty, about 305 lb (140 kg). Filled with water, gravel and rocks, about 2,080 lb (945 kg). Add the weight of the stand to find the load on your floor.
What size heater does a 210 gallon tank need?
In a normal room at 68 °F (20 °C), 2 × 300 W holds 78 °F (25.5 °C). In a cold room use 2 × 500 W; in a warm room 2 × 150 W is enough.
How many fish can I put in a 210 gallon tank?
It depends on the fish, not just the gallons. As the only kind in the tank, a 210 gallon tank carries about 60 or more neon tetras, or 60 or more guppies, or 60 or more bronze corydoras. Mixed tanks hold fewer of each.
How many liters is a 210 gallon tank?
210 US gallons is 795 liters. Once set up with gravel and decor, the tank holds about 676 liters (179 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