My fiance and I got two guinea pigs about 4 months ago and one has always been abit of a bully but the other never really minded and shrugged it off. Recently I decided they needed more space so I built them a space with 16 Sq ft (next time I have time I'm building a full second tier to double their space) anyway the bully didn't seem to appreciate the change of space and he got more aggressive with our second piggie. I didnt think much of it until I decided they needed more friends for the extra space and got two more. They are about half the size of the original two and the bully has been more aggressive than I have ever seen him. That being said his original "victim" seems to stick up for the smaller ones if he deems it too much. I feel like this should calm down after a few days (this all happened yesterday) but I'd appreciate some input (and yes I realize now that I should have given him adjustment time before introducing new "friends" into the new house... Hindsight being 2020 and all)