The opposite sides of a trapezoid that are parallel to each other are called bases. The remaining sides of the trapezoid, which intersect at some point if extended, are called the legs of the trapezoid. The top and bottom sides of the trapezoid run parallel to each other, so they are the trapezoid's bases. The other sides of the trapezoid will intersect if extended, so they are the trapezoid's legs. The segment that connects the midpoints of the legs of a trapezoid is called the midsegment.
BODY STRUCTURE: The most expensive aquarium fish in the world is the Platinum Arowana also known as White Arowana.The most expensive ornamental fish can coexist with every bigger then their mouths and not aggressive fish species.More than an Arowana in a tank is dangerous because they will fight each other.
The coldwater fish most suitable for small tanks are white cloud mountain minnows which can tolerate temperatures down to 12 C. If the water temperature will stay at around 20 C, you could also consider keeping zebra danios, temperate corydoras or some of the small barbs such as cherry barbs.oldfish are the commonest coldwater fish and they are ABSOLUTELY NOT suitable for bowls or small tanks. You need a minimum of 20 gallons for one goldfish with an additional 10 gallons of space required for each additional goldfish.