Looking for advice on breeding fish room build out for tank sizes

[MT Aquatics]

I am breeding rainbow fish, is a 20 gal standard to small to keep a trio in long term? If so what would be the better option to hold multiple breeds of rainbows. 

[Colu]

I think 20gallon tank I bit small for bigger species of rainbow fish long term as they are very active swimmers they would be fine for some of the smaller species like Pseudomugil  I would go with 40or 55g for bigger species 20g for smaller species of rainbows

Edited April 4, 2021 by Colu

[FrostiesFishes]

I like 29, and 40 breeders best they fit so many needs. And depending on species of rainbows a 20 would be fine for a trio. A 20long would be better . But if you already have a bunch of 20h . I’d just use them.

Edited April 6, 2021 by FrostiesFishes

[Cory]

Most important factor is what you'll be happy with. I believe I could breed rainbows even large ones all day long in a 20H. The difference between what a hobbyist keeps and what a breeder uses are usually quite different.