Breeding Neon Tetra’s or other tropical fish.?

Apparently, the snails in the tank are eating the eggs, as we have the fish for about 2 years, and no fry have been seen. Anyways, If i were to get another tank, give it the correct requirtements, and left a male and female in the tank for 2 days+nights, Would they certainly breed ( in the event they are healthy)

Thanks
In addition to what has been said, even though you said snails might still be the problem, I still dont want them. Is there any product we can poor into the tank to kill the snails, yet do no harm to the fish.
Also, do you know any buetiful, colourful fish that are easy to breed, dont try and eat fish (like tetra's) and one last note, What about tigre barbs, i have noticed that the some of the tiger barbas have gotten fat around the the middle, Is this just fat, or eggs, and if they are just eggs, how come no male has…made his move? :/