any thoughts on this?

nope. for similar reasons of the mollies

My husband put a little oranda in with his platties and sword tails (against my advise) and they picked the poor thing to death over night.

I had a common gf in with trops for awhile and he was chased by a molly and a swordtail. The platies never bothered him.

Big no. Platies are tropical fish, having different requirements than goldfish.

no, goldies require cool temps as platies need warm heated water and some salt too.