Answer to question #1:
Buy fish all of the same sex or buy juveniles.
Answer to question #2:
Mollies, platys, swords, guppies, endlers are a few livebearers. Egyptian mouth brooder, S. mossambiques, convicts, are some cichlids. Another egglayer I would recommend is the Celestial Pearl Danio. I have found this little fish to be quite easy for an egg scatterer.
herefishy summed it up there. Guppy's are incredibly easy. along with all livebearers.
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