The names of all of these different types of guppies focus on the tails because they are so remarkable and unique. The tail itself is usually about one third of the size of the whole fish. It is possible to mix guppies with other varieties of fish. However be careful when mixing because, guppies are targeted as easy prey due to those fancy tails. All about Care for an Acrylic Aquarium Kit The practice of keeping aquariums came about in the late 1800's. They were fairly crude. Usually these ancient aquariums only had one side that was made of glass, with the other three sides being made of metal or wood. Most aquariums consisted of fish that were native to the region of its owner simply because of availability. Aquarium Care for Freshwater Fish Freshwater fish are perhaps the easiest fish to care for in comparison to saltwater species because they are usually hardier fish. A basic aquarium set up will be required. You will need a tank, some rocks or substrate to line bottom of the tank. You will also need a filter, and some lighting. Make sure that you rinse the gravel thoroughly before placing it in the bottom of the tank. If you have some decorations, you should add them now. Make sure that you rinse them well before putting them into the tank. Also be sure that the goldfish have plenty of room to swim, as they as active fish. Give them a place or two to hide, and that should do nicely. To begin, the first thing to do is assemble your aquarium. Find a spot in the home that you wish to have it displayed. Follow through with the set up as you would a freshwater tank. When you are ready to add the water to the tank, follow these simple steps. First, pour the sand into the bottom of the tank. This bacteria, turns the ammonia into nitrites which are more tolerable to fish than ammonia. Next, different nitrifying bacteria will turn the nitrites into nitrates, which are even less toxic to the fish and other aquarium life. The nitrates are collected and minimized by filters; however they will eventually accumulate in the tank.