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If they are floating, that is not a good sign. Cories are substrate spawers. The rasboras--I'm not sure if they are egg scatterers or substrate spawers.
lucky for me I have avoided getting snails. I remember when I was much younger and we had a tank that got infested. That turned me off of snails Big time! I have been very careful about not getting them. I dont know what those things were in my tank, and since I have dieing fish, my philosophy right now is, if I can't identify it, its coming out!