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Tank Size
The minimum size tank for a breeding pair of Angelfish is 15 gallons, but should be 25 gallons or larger if you plan on leaving the fry with the parents. As you can imagine, a fully grown pair of Angels with 200-300 fry to herd around would be pretty cramped in anything smaller. Another plus to having a larger tank is that there is a better feeling of security in a larger tank and the parents aren't as apt to eat their eggs or young.
Choosing Breeder Angelfish
The best way of assuring yourself at least one young pair is to choose 6 perfect specimens from a large tankful of young angels. This method is less expensive than buying proven breeders that may be near the end of their breeding careers anyway.When preparing to buy 6 Angelfish, take your time to study the fish and select only those with straight top and bottom fins and perfect 'feelers' without any bowing or bends in them. They should be strong, robust and active. Angelfish that are active feeders mean they will grow quickly, and have a high rate of egg production in the females.
Do not buy fish from a tank with either dead fish in it, with fungus or parasite infestations. Resist the urge to 'come to the rescue of the little ugly duckling' because it will only grow up to be a big ugly duckling and will be totally unsuitable for breeding purposes. Be extremely picky with your breeder selection and you will be rewarded with beautiful fry.
Once you have carefully selected your 6 potential breeders, they can be set up in a 20 gallon tank minimum to grow up in and to finally pair off. If they are fed well with a good selection of live foods, they will grow quickly and reach breeder size rapidly.
One sure way to acquire a true breeding pair of Angelfish is to purchase a proven pair from a breeder. When you purchase a pair this way there is always the possibility that they are at the end of their breeding career.
Spawning
In mature fish, breeding can be stimulated by a partial water change and a rise in temperature to between 80 and 82 degrees F.
One sure sign that spawning is about to occur is the appearance of the pair's genital papillae. These look like little nipple-like projections and are called ovipositors (oh vi poz' uh turs), a word that literally means "egg-placer(s)". The female's ovipositor is larger and more blunt than the male's which is slender and more pointed. These protuberances which appear at the vent are used respectively for depositing eggs and fertilizing them. The obvious differences in the genital papillae are the first completely reliable indication of sex determination.
The pair will select a spawning site and thoroughly clean it about two or three days before actual spawning takes place. When the cleanliness of the spawning site finally meets the approval of the parent fish, the female will make a few test runs. She will pull her ventral fins or feelers close to the lower sides of her abdomen and her anal fin will be situated so that her entire lower line is relatively straight. Her ovipositor will then be able to make full contact with the slate, leaf or whatever was chosen for a spawning site. The male will then make a few practice runs too before the actual spawning takes place.
When spawning actually takes place, the female will pass over the site and eggs are deposited which adhere to the surface. The male then moves in and scoots along over the string of eggs just laid and fertilizes them, his fins taking the same position as the female's so he can press closely to insure a higher fertilization rate.
The male and female Angelfish will take turns making passes over the spawning site until several hundred or more eggs have been laid, depending on the size and condition of the female prior to spawning. The parents will hover closely over the spawn and fan continuously with their pectoral fins to create a circulation of water over and around the eggs. Some unfertilized eggs will turn white in a matter of hours and will be removed by the parents.
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