I have Dutch & Harlequins which are similarly sized. The smallest cage I would use is 24x24" but 24x30" is much better. 24x30 is necessary for a doe + litter.
Ah! So you're familiar with both Thriantas and Fl Whites, eh? Have you ever dressed out a Thrianta by any chance? I'm wondering how the carcass would compare to a Florida White. My little guy is so stocky and solid. Wondering how they compare in other ways, too.I use 36x24 for my senior Thriantas (ok, my nephews Thriantas) and 24x24 for the jr's. Same size for Florida Whites but, mind you, they only keep 6 holes - lol. I use the same size for my Fuzzies for the sr's (36x24 and 24x24) and have 18x24 for the jr's. Have 30 fuzzy holes.