We have two 18m boars who we have adopted recently ish, and who have lived together most of their lives.
One is a more boisterous and hyper, the other more chilled. The boisterous one is always on the quieter ones case, we think as much out of boredom as dominancy or anything else, so are trying lots of ways to give him some activities and so on, as well as bigger space etc.
We thought some mirrors in the cage might be nice, but thought best to double check if they are suitable (they have quiet a smell to them at the moment, but we haven't put them in the cage yet, and were hoping the smell will disappear after 'airing')
Hope this makes sense?!