When Are Platys Fully Grown?

Once they have grown large enough to fend for themselves, you can move the young fish to the community tank with the older fish. Platy reach full size after about four months.

How large is a full grown Platy?

The platy (Xiphophorus maculatus) grows to a maximum overall length of 7.0 cm (2.8 in). Sexual dimorphism is slight, the male's caudal fin being more pointed. The anal fin of the male fish has evolved into a gonopodium, a stick-shaped organ used for reproduction. The female southern platyfish's anal fin is fan-shaped.

How big will my platys get?

How big do platys get? Platies grow to around 2-3 inches (5-7 cm) in size, but dwarf platies (which have been selectively bred for their shorter body length) usually stay around 1 inch (2.5 cm).