As Helter has said, swordtails and endlers (assuming you have females) will breed without much encourgment from you and produce live fry. The only problem is that they may then proceed to eat same fry- as will others in the tank (the gourami springs to mind). So if you want to rear them, you would either need to set up a separate baby tank, or keep the babies in a breeding net for the first few weeks. Note that swordtail fry in particular can only stay in the net for a short period of time or their growth will be stunted. After that, you'll have to let them out. Also note that livebearers will go on having fry every month, even if you separate males and females (females store sperm) so it is easy to get overrun. Fry can be fed crushed flakes.
Danios lay eggs, quite easy to encourage them to do so by feeding them live foods, the only problem is that they and the other fish in the tank will regard the eggs and any hatching fry in the light of a nourishing snack- so the eggs need to be hatched in a separate breeding tank. The eggs are fertilised while they are laid, so you can only get fry if you have male and female together in the tank at the time the eggs are laid, moving an eggbound female on her own won't work (unlike with livebearers). Fry are small and need to be fed liquid fry food or tiny live foods.
The tetras are also egglayers but much harder to breed. They will only spawn if the water is soft and acid, they need to be conditioned first, and I have heard the male and female need to be exactly the right age at least for neons, the eggs have to be protected from other fish (including parents) and from daylight as they are light sensitive. So it's not something that's going to happen in your community tank, you need a special setup.
Not sure what it takes to get the gobies to spawn. And the gourami won't do it on its own. 1
hi everyone i have a 35gallon tank with the following fish in
