If you have a marine or saltwater aquarium, or have decided to get one, then you will find some of the most colorful, most unusual fish and animals in the world.
There have been many advances in the keeping of marine fish in the last 30 years.
They now have live sand and live rock which helps in setting up a marine aquarium. There are some great cannister filters and under cabinet reef filters that work very well. A lot of these filters have bio beads, and/or bio balls which support huge amounts of beneficial bacteria that help control ammonia and nitrite in your tank. The live sand has a similar type of bacteria to help this too.
They now make lighting that puts out the correct spectrum and intensity to aid in the keeping of the many anemones, and live corals for marine aquariums. These include high output compact lights, metal halide, which is very bright and intense, actinic , and 10,000, and 20,000k bulbs. You can get these, and many other combinations of lighting and bulbs to suit most needs for marine systems. Most fish don't need too much in the way of extra lighting.
Keep in mind when keeping a marine aquarium, that the ph of the water must always be 8.0 or above. The temperature should be around 77 to 80 degrees. The salt density will vary depending on whether you keep just fish, or fish with anemones and corals, or just invertebrates. The fish only tanks tend to have a density of 1.018 to 1.022, and the corals and anemones tend to be a little higher at 1.022 to 1.025.