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How long does it take for my female betta to reach full size?

Updated On September 23rd, 2025

Pet's info: Fish | Unknown - Fish | Female

I asked this question a few days ago, but how long does it take a female betta to reach full size? I believe she's a Veiltail, and I got her when she was a baby, though I don't know how old she was when I got her. She's in a 1/2 gallon tank, I change the water weekly, and I feed her 5-6 Hikari Micro Pellets every other day. She's typically very energetic and constantly moving, so she seems healthy... I just want to make sure nothing's wrong with her!

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1 Answer

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Answered By Angel Alvarado, LVT

Licensed Veterinary Technician

Published on December 24th, 2017

Bettas, both male and female, are considered "full grown" at about 7 months of age. There may be some growth until a year of age with most specimens measuring 2-2.5 inches in length. Freddie looks to be in fine form in the images provided. Be sure to maintain water quality and temperature. Bettas do best between 78F and 80F. For water changes, use only aged or conditioned water that is temperature matched to prevent stress or shock.

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