In 1968, the German Köhlmoos brothers invented the world's first aquarium with an integrated lid and lighting source. The following year, the Juwel Aquarium founded by Köhlmoos was officially inaugurated. 50 years later, German Black Diamond has become a leading European and world-renowned brand of aquarium products, with products covering filters, filter materials, fish tank lights, thermostatic rods, automatic feeding systems and other aspects. Unlike many manufacturers who started with aquarium equipment and later launched finished aquarium products, finished aquariums have been the main business direction of Black Diamond from the beginning.
 
The unmatched systematization and compatibility of other brands is an important reason why Black Diamond's finished aquariums occupy a leading position in the industry. Systematic refers to the various series of aquariums of Black Diamond, which have a clear positioning and corresponding use needs in the design, and the aquarium is equipped with targeted design technology and hardware equipment. Compatibility means that Black Diamond's own brand of appliances or components are used as much as possible in the box, which are fully compatible with each other and can be replaced at any time. The practical design and excellent quality make Black Diamond one of the few finished aquarium brands recognized by most senior aquarium players. Even if the manufacturer does not promote it vigorously in China, the brand is still well-known in the player circle.
 
At present, Black Diamond's finished aquariums are divided into five series: Rio, Vision, Trigon, Lido and Primo. Among them, Rio is the most classic series of black diamonds, with moderate specifications and configurations, while the Vison and Trigon curved cylinders are mainly high-end routes and slightly larger in size. The youngest Lido and Primo are the cheapest and the smallest in size, making them suitable for beginners with smaller home areas.
 
As a classic series of black diamonds, the Rio series has a high reputation among aquarists at home and abroad. The series is divided into five sizes: 125, 180, 240, 350, and 450, and these numbers show the maximum volume of the water tank, and the unit is L (liter). The only difference between the different models is the product specifications, and the same configuration is used in the design and accessories. The RIO series uses float glass with no curvature on the surface, the cabinet is a rectangular design, the upper part is braided, and the color of the base cabinet can be matched to the aquarium. Like the rest of Black Diamond's collection, the Rio finished aquarium incorporates Black Diamond's own lighting source, filtration system and automatic heater, all of which are placed inside the aquarium to maintain the aesthetics of the aquarium.
 
Black Diamond's aquariums are equipped with a filtration system called BioFlow M, which is officially known as the "heart of the Juwel aquarium". This self-developed filter is composed of multi-layer filter media and circulating pump, in which the combination of white cotton, black cotton, Nitrax green cotton, coarse cotton, carbon cotton and other filter media allows the water to flow through the top of the filter at high speed to filter impurities; At the bottom, it passes at a low flow rate, which helps the growth of beneficial bacteria, and the filtration efficiency is much higher than that of other back filtration systems on the surface. At the same time, the compact size of the Bioflow allows small tanks such as the Rio, Lido and Primo to have plenty of space to grow fish or aquatic plants, even with a back filtration system.
 
The combination of the Rio125 aquarium and base cabinet costs 4,400 yuan, while the largest 450 is priced at 8,000 yuan. In addition to Rio, the Vision and Trigon with curved glass are also the main collections of Black Diamond. The Vision is available in 180, 260 and 450 sizes, while the Trigon is only available in 190 and 350 models. In addition, the biggest difference between Vision and Trigon is that the former is a cuboid-based aquarium, and the front side glass adopts a curved design; The latter, on the other hand, has a scalloped design with only three sides, and the front glass has a larger curvature than the Vision, allowing it to fit perfectly into the corners. The cost increase brought about by the design and process makes the Trigon more than 1,000 yuan higher than Vision's products in the same volume, for example, the Vision180 is priced at 6,400 yuan, while the Trigon is priced at 8,000 yuan.
 
In terms of accessories, Vision and Trigon are the same, only the specifications are different, so if the environment allows, it is recommended to choose the Vision with a wider vision; The fan-shaped Trigon is suitable for families who want to live in an aquarium and do not want to damage the home environment. As full-featured and well-designed ready-to-use aquariums, Vision and Trigon can be used for fish, aquatic weeds and even marine life.
 
The Lido series, priced at 4,200 yuan, has a minimum volume of 120L, but due to the use of a cube design, the water depth is not much different from that of a 125L cuboid aquarium, which is more suitable for aquatic weed farming. The Primo series for entry-level users has a minimum volume of 110L, and uses relatively rudimentary equipment for the lighting source and filter system, so the price drops to about 2400 yuan. However, considering that most novice players will choose fish or aquatic plants that are less difficult to farm, the configuration of the Primo series is still enough to meet the needs and is worth recommending.
 
German Black Diamond currently has opened an official flagship store on the online shopping platform, but it is negligent in publicity and management, and the customer service response speed is slow. It is worth noting that many of the black diamond finished aquariums in the flagship store have two options of "domestic assembly" and "original import", and the price of the original imported products is close to 1500 yuan higher than that of domestic assembly, and consumers are advised to choose according to their budget.