I thought it was the cage people were saying was too small before? I think the house is fine as I know how much robos love to snuggle up close together but you will need a second house (something with more than 1 exit would be best) so that they have the choice of being away from each other, 2 of everything is always the best answer with pairs. Even if they don't use everything they will always have the option to have a break from seeing each other 24/7 and will be less likely to fight.
Tehe I just had the joy of watching one of your robos eat his breakfast whilst the other one 'rocked' back and forth on the wheel ^_^