new rainbows, new keeper

The first is a nice male. The second pic is hard to make out and I think the bottom is a male and not sure of the top one unless you can get another pic.
 
This is also a male, maybe a younger one or the subordinate one.
what size tank is this? You want to have at least 5 because they are schooling fish (if you have the room). 2 females to 3 males would work fine.
 
Nice fishies!!!
 
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