Seperate it from the other grown fish asap.
Usually. Most fish dont pay attention to baby fish, they will usually eat them, as far as freshwater fish, I know that you can keep Betta fish male, Plecostomus, and Chicleds with there babys.
fish are naturally cannibalistic i would suggest some fake grass that hangs upside down in the fish tank, you can find it at walmart
yes
If you find a dead fish in your tank, you should remove it promptly to prevent any harmful effects on the water quality. Check for any signs of illness or stress in your other fish and monitor the tank closely for any changes in behavior. It's also a good idea to test the water parameters to ensure they are within the appropriate range for your fish.
Only if you don't mind it eating the fish !
watch for stress; find out if they are "schooling" fish; possibly separate them, or get a larger tank
You can do one of three things. 1. Leave the pregnant fish alone in the main tank and just let the pregnancy happen. They baby fish will probably find hiding places themselves. 2. Get a breeding tank. Leave the pregnant fish in the main tank and then when you see a fry, net it, and put it in the breeding tank. 3. Get a breeding tank and put the pregnant fish in it and just leave it. Whenever the pregnancy is over, put the pregnant fish in the main tank but leave the fry in breeding tank.
until it looks like the same size of the other one
the shop has baby fish food that's what you feed them
If you find a dead fish in your fish tank, you should remove it promptly to prevent any contamination of the water. Check the water quality and make sure it is suitable for the remaining fish. Consider testing the water parameters and performing a partial water change if necessary. Keep an eye on the other fish for any signs of illness or distress.
You should not put your Betta fish in the same tank in the first place, most likely the male will kill your other fish. by res do you mean red eared slider?
if there is a black out and you do have a fish tank you should be fine an less you have a chinease fish or any fish that is in the red mark for fish