well first check if the boy is chasing the girl then they are breeding. the boy has a stick like fin the girl has a triangle like fin
No, fighting fish (Bettas) are only interested in fighting with other fighting fish.
Male Platys (and Swordtails) are notoriously bad tempered fish and often fight and bully one another. That is simply part of their nature.
No.
no. fish can only mate with fish of the same species. Gouramis mate with gouramis and platys mate with platys.
Mickey Mouse Platys don't lay eggs. They give birth to live fish.
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On average, for 28 days.
Yes, they get on quite well.
some goldfish, mollies, and guppies
yes and they can more than one at a time
swordtails
Platys and black skirt tetras can live together. Harlequin rasboras, platys, and guppies are smaller than black skirt tetras and would do well together. However, the black skirts nip at fins, so if you have fancy tail guppies it is not recomended to put them in a smaller tank together.