1. Weight of the water:
- 1 gallon of water weighs approximately 8.34 pounds.
- Therefore, 30 gallons of water will weigh 30 * 8.34 = 250.2 pounds.
2. Weight of the fish tank:
- The weight of the fish tank will vary depending on its material and size.
- For a standard glass fish tank without substrate or decorations, the weight can range from 25 to 50 pounds.
3. Total weight:
- Adding the weight of the water (250.2 pounds) and the weight of the fish tank (let's say 40 pounds), the total weight of a 30-gallon fish tank full of water is approximately 290.2 pounds.
Please note that this estimation does not include the weight of any additional items in the tank like substrate, decorations, or aquarium accessories, which can add to the overall weight. It's always best to verify the weight specifications provided by the fish tank manufacturer.