They are white skirt tetras, an albino variety of Black Skirt Tetras. They have been cruelly dyed, as Clerk stated. They are egglayers, and therefore a lot harder to breed in the home aquarium versus livebearers, but if you research "black skirt tetra" breeding methods, you should get good results. The females are fatter and have stockier bodies, whereas the males are somewhat narrower.
I'm not sure about platies breeding with mollies. I've read that platies can interbreed with swordtails, but not the mollies.
Black Skirt tetras are also pretty aggressive for tetras, and sometimes you'll get a rogue one that will continually harass everyone else.
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current setup:
15 gallon, planted w/ pressurized co2, 55watts PC lighting, EI fert dosing.
-5 harlequin rasboras
-7 Aspidoras pauciradiatus (sixray or false corydoras)
for reference: my name is Julie 
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