gouramis can be quite territorial so 'he' is in 'her' tank! and she doesn't like it.
if you have a divider you can separate them until they get used to seeing each other and then try it.
I did that with a really aggressive betta who would not accept anything else in the tank.
I kept the platy on one side of the mesh barrier for about 3 months.
Finally I removed the barrier and they get along fine now.
Watch them really carefully every few hours in case you have to get the new fish out in a hurry in order to save its life.
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mousey
Toronto. Canada
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