How long until discus fish lay eggs after breeding tank setup?

Allow the male and female to see but not reach each other. When the male is ready to mate, he will build a bubble nest. When the female is ready, she will "bar up" and develop vertical stripes. At this point, they can be introduced to one another for breeding. The time for each fish to be ready depends on age and environmental factors.

She may spawn (lay eggs) about once a month. The male will then pass over them and fertilize them. Most male parrotfish are infertile, so be prepared to not have any viable eggs. Unfertilized eggs will turn opaque or cloudy after a day or two due to fungal growth. If the parents don't eat them, remove them to prevent fouling the tank.

In the aquarium, the female requires a dry land area, with a patch of slightly moist sand, 25 cm (10 inches) in depth, in which she will lay her eggs. Create distinct water and land areas. The land area should occupy one-third of the tank and should be filled with a mixture of peat and sand.

There are several species of Tetras and sexing them can be tricky or downright difficult. Neons are the easiest. Look at the neon line along the body. If it is straight, you have a male. If there is a slight curve, you have a female. In other species, it isn't as easy. Females are generally rounded and fatter. Males are longer and slimmer. Male Danios have more vivid and shiny colors than females. Both have yellow between the stripes, but males are more vibrant. Male Danios will also be longer and slimmer while females will be shorter and "thicker". If they spawn, you can leave the eggs and adults in the main tank. The adults will eat the eggs...or fry (baby fish) if they hatch. You can also vacuum the eggs out and discard them.

Yes they could possibly hatch. Cichlids are known to cross breed. However, they need to be fertilised. Best watch which one of the cichlids is guarding the eggs and fanning them. After a few days you should see little black dots in the eggs, which is a sign that they are developing.

Beta fish lay eggs and she would need a male to then fertilize those eggs after she lays them. Breeding betas can be very work intensive. Here is a link with great information: fishkeepingworld.com/breeding-betta-fish/ As the babies get bigger, they can graduate to larger food. The babies will mature and need to be separated around 3 months of age. The females can stay together but all the males will need to be separated. Breeding betas requires a lot of tanks/space. I recommend to connect with a local aquarium store and find out if anyone has first hand knowledge. I hope this helps and please feel free to post any additional questions.

On average, a platy female can spawn 20-50 fry (baby fish). The first spawning may be less. If she still appears bloated or round, she may still have fry to spawn. If no more appear after a day or two and she is back to "normal" size, then she can be returned to the main tank. The fry should remain in a grow out tank or they will likely be eaten.