This tool is quite simple. What it does is helping you calculate the volume of several 3D prisms that are commonly used for a fish tank.
The shapes that are currently supported are:

• Rectangular aquarium
• Cube aquarium
• Bowfront aquarium
• Corner Pentagon aquarium
• Corner Prisim aquarium
• L-Shaped aquarium
• Flat Hexagon aquarium
• Hexagonal aquarium
• Octagonal aquarium
• Ragular Polygon Prisim aquarium
• Cylinder aquarium
• Half Cylinder aquarium