“Tank-moulded tank” typically refers to one of two distinct categories: rotomoulded/blow-moulded water storage tanks or moulded glass/polycarbonate aquariums. Both types are defined by a seamless, one-piece construction that prevents leaks and increases durability. 

• Water Storage Tanks
  These are heavy-duty containers used for residential and industrial water storage, manufactured using high-heat moulding processes. 
  Manufacturing Processes:
  Rotational Moulding (Roto-Moulding): Uses heat and biaxial rotation to create thick, stress-free walls with reinforced corners. It is the gold standard for large Roto Moulded Water Storage Tanks.
  Blow Moulding: A faster process that produces Blow Moulded Tanks which are typically lighter and more cost-effective for medium capacities.
  Key Features:
  Layering: Available in 2 to 4 layers (e.g., 4 Layer White Foam) for UV protection and thermal insulation.
  Materials: Made from food-grade virgin plastic (LLDPE/HDPE) to ensure water remains potable.
  Top Brands: Leading manufacturers include Sintex, Supreme (Siltank), and Vectus.
• Moulded Aquarium Tanks
  In the pet industry, these are “all-in-one” fish tanks with curved front edges rather than siliconed joints.
  Design: Feature a single piece of glass or polycarbonate bent at the corners, providing 360° viewing without obstructive seams.
  Components: Often sold as kits including a built-in filter, LED lighting, and lid.