40 Breeders are 36" long, so 91cm. A 40 breeder would be fine for a grow out, my large red wolf was in a 50 breeder which measured 48" x 18" x 13". The 48" x 18" footprint was perfect for a 10" fish.
I'm in hopes when he's in the 6" - 7" range he'll be fat enough that he can go in to the 125g with my bichirs.