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I'm pretty sure I can remember someone on here saying they have kept robos in the HH, not having had a robo myself I'm not sure, I only know it's been fine for me with Chinese & Russian hams, both bigger than robos but Chinese are quite slim, it depends a bit on the size of your robo too as like all hams they vary in size.
The bar spacing is a little larger than some dwarf cages, apart from the worry of escapes you have to think about whether she could possibly squeeze her head into the gap & hurt herself.