AdamsZoological
Aquarium Advice Freak
What types of Mbuna? Some genera are much more aggressive than others, and therefore need to be kept in a different manor, I've seen cases where understocked Mbuna have done fine, but, I've personally maintained over 18 different Mbunas tanks, and 9 times out of 10, the overstocked tanks were much more peaceful, and harmonious.
Back to the Discus, instead of an argument in here, maybe a referance of material from an expert would help. I'm going to paste some key points from an article by John Benn. Mr. Benn is a writer for Aquarium Fish Magazine, has been a hobbyist for over 25 years, and is past president of the Federation of American Aquarium Societies and the International Betta Congress.
I recommend that aquarists just beginning with discus start with six to eight quarter-size fish. They should be housed in a 10- to 15-gallon tank to avoid stressing them during the first several weeks. As the fish grow, they can be moved to larger aquariums. Very young discus seem to suffer from stress when placed in a tank that is unnecessarily large.
When setting up a larger tank, choose an aquarium between 55 to 125 gallons in which the discus can grow to full adult size. When adults begin to pair off for breeding, they can be moved to 40-gallon breeder tanks. Some discus breeders, including Wattley, use 20-gallon "high" tanks for breeding, but I prefer 40-gallon breeder tanks, which are essentially square. Avoid overcrowding the tank with fish. A standard 55-gallon tank should house no more than six adult fish. A good rule of thumb is to allow 10 gallons per adult fish.
Back to the Discus, instead of an argument in here, maybe a referance of material from an expert would help. I'm going to paste some key points from an article by John Benn. Mr. Benn is a writer for Aquarium Fish Magazine, has been a hobbyist for over 25 years, and is past president of the Federation of American Aquarium Societies and the International Betta Congress.
I recommend that aquarists just beginning with discus start with six to eight quarter-size fish. They should be housed in a 10- to 15-gallon tank to avoid stressing them during the first several weeks. As the fish grow, they can be moved to larger aquariums. Very young discus seem to suffer from stress when placed in a tank that is unnecessarily large.
When setting up a larger tank, choose an aquarium between 55 to 125 gallons in which the discus can grow to full adult size. When adults begin to pair off for breeding, they can be moved to 40-gallon breeder tanks. Some discus breeders, including Wattley, use 20-gallon "high" tanks for breeding, but I prefer 40-gallon breeder tanks, which are essentially square. Avoid overcrowding the tank with fish. A standard 55-gallon tank should house no more than six adult fish. A good rule of thumb is to allow 10 gallons per adult fish.