A brackish aquarium is an aquarium whose water has a higher salinity than freshwater. So, certain breeds of fish are more apt for brackish aquarium.
Guppies: The fantail guppy is a very easy fish to keep and is well-known for being tolerant of varying water conditions which makes it a perfect fish for the brackish aquarium. Guppies are peaceful community fish that do best in groups of three or more and they tend to breed prolifically. Mature female guppies reproduce as often as every 28 days, bearing between 2 to 50 fry each time. Guppies vary in color and size – females tend to be larger and less brightly colored while males usually only grow to an inch and a half in length and exhibit a wide range of colors and patterns.
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Mollies: Like guppies, mollies are known for being very easy to keep and they do very well in community tanks with other of their species. Mollies are livebearers that are naturally found in coastal streams as well as in brackish and marine waters. This breed of fish is very hardy and can tolerate salinity level up to 87ppt. There are many different breeds of molly including black molly, the sailfin molly, dwarf mollies and more. In the wild, mollies feed on small insects and vegetation but the home aquarium they enjoy a varied diet of flake, dried and frozen foods.
Swordtails: Another breed of livebearer, swordtails vary in color from red, to orange, to green. Male swordtails are characterized by a pointed, sword-like extension of their caudal fin. In the home aquarium, swordtails breed easily and frequently and it is wise to keep several females for every male so the male swordtails do not become very aggressive. The swordtail is a very active breed of fish and it is best kept in aquariums ten gallons or larger with others of its species.
Archer Fish: A species of rainbow fish, the Archer fish is known for its black-striped body and the turquoise, yellow, or orange spawning stripe on its fins. These fish are peaceful community fish that can be difficult to keep in home aquarium as they grow up to 12 inches and are fairly picky eaters. Archer fish feed on insects on or above water surface and it may be difficult to assimilate them to an aquarium environment for feeding. Archer fish are best kept in a tank with temperature between 77 and 88 degrees F, a pH between 7 and 8 and a 1-2% salinity.
Catfish: There are many breeds of catfish and most adapt well to a brackish water environment. The Banjo catfish has a black and white body that appears almost flat. It can do well in a brackish aquarium though it may take time to adjust. Shark catfish are relatively easy breed of catfish to keep but they require a great deal of space. Most catfish keep to the mid and lower levels of the aquarium and prefer live foods over pellets and tablets.
Glassfish: Naturally found in the brackish waters around India and Thailand, the glassfish is fairly easy to keep in the brackish aquarium. This breed of fish is somewhat oval in shape with an arched back and a semitransparent body that appears to change water hardness between 8 and 20. Glassfish prefers live foods like tubifex worms and bloodworms but they will also eat flake and frozen foods.
Gobies: Gobies are found in many habitats. The Bumblebee goby can be kept in slightly brackish water with warm temperature and alkaline water. The Common goby is well adapted to brackish environment and easily kept in a small aquarium. The Lancer or Knight goby is also good.
Fingerfish: Fingerfish or Mono angels, resemble angelfish as they have pointed fins. They are best in alkaline brackish aquarium. They grow between 6 and 8 inches. They are nervous and require a slow acclamation period. They feed on meat and vegetable-rich meals of live and frozen foods.
