I've got a couple of Rosey Barb fry that I discovered when I took down
a 10g community tank. They were rescued and placed in 5g tank to grow a
bit. My question is how big should they be before introducing them into
the 33g community tank with their parents? Currently on appears to be
about 3/8 inch (~8-9mm) long and the other about 1/2 (~13mm)inch in
length.

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Cheers,
Kurt