Sherman was 1 year old when I got him and he went into a 3ft viv.
Pack it out with lots of hiding places and, another trick, suspend some Exo-terra vines across the ceiling of the viv with one of the 6ft lengths of fake ivy draped around it. Has the effect of lowering the ceiling height. Also have a rummage in the cork bark box at the rep store and look for the cork bark tubes. Sherman can get from one end of his viv to the other without being seen if the mood takes him .