hi, i am new to keeping guinea pigs and last week i got 2 baby male guinea pigs that appear to be settling in fine to their new home ! however, one uses the solid wooden ladder down to the run just fine but the other one will not. is it just a case of him getting used to it still (he goes back up it ok but never down) or is there something i can do to encourage him down ? i would be very grateful for any advice anyone has on this. best wishes samantha