[header] How to fold tank tops [title] Spread the tank out facedown. [step] Lay the tank top on a flat surface, like a table, and smooth out any wrinkles. [title] Fold both sides lengthwise into the center. 
[step] Bring the left edge in so that it aligns with an imaginary line running vertically through the center of the tank. Bring the right edge in so that it aligns with the center line as well.