Are guppies tetra and platys fresh water fish and are they compattable?

Yes they are freshwater fish and very compatable. The guppies and platties have alot of babies and never stop reproducing until their dead so I u get them, get a fish to control ur baby population like a feme veiltail bEtta or a school of 5-6 danios. Most tetras are fine except for the searpe ones. Neon cardinals pristella, glolite gold gold neon etc are all great