Tropical fish are usually brighter in color, and therefore more appealing to aquarium lovers than the fish available in the cold water variety. Most people are somewhat familiar with a few tropical fish such as the Clownfish or the Angel fish. However, few people have heard of such cold water varieties as, the Shanny or the Tompot Blenny. Research to find out what type of specific corals, sponges and plants the fish have in their open water environment. If a particular fish lives on a coral reef, try to incorporate that into the grand scheme of the aquarium. Stress can be minimized by providing ample opportunities for fish to act normally. Do a lot a research to find out what type of filter is suggested for the fish that you choose. There are filters that go beneath the substrate in the bottom of the tank, as well as filters that attach to the side of the aquarium. They also vary greatly in price. It is not necessary to buy the most expensive filter when setting up a basic freshwater aquarium. The most important factor in growing and maintaining healthy aquarium plants is the lighting used. For a well planted aquarium, it is suggested to use 2-3 watts per gallon of water. The use of fluorescent bulbs is practical and adds a nice lighting effect. Take caution when deciding to use florescent lights if your tank has a depth of 20" or more. The best thing to use to remove algae is phosphate drops. When added to the water on a regular basis, algae does not build up as quickly. Another way to avoid an algae problem is to invest in some hermit crabs and snails to keep your rocks and tank clean. Hermit crabs and snails are known to be the clean up crew, and can make a huge difference in your saltwater aquarium if you have enough of them. 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.