I finally relented after years of the DC begging for guinea pigs. There were absolutely none at rescues for miles around after a lot of trying and waiting (maybe because of lockdown, who knows), and in the end I went to a breeder and we brought home 3 nine week old little guinea girls the week before Christmas.
They are in a 4x2 C&C cage with a 2x1 loft indoors for now although we have got an outdoor cage for spring/summer hopefully. I think long term the 4x2 wouldn't be big enough, but they are still small for now.
Anyway my question really is about whether we should ignore them chasing, pinching food and squeaking at each other. I am totally ignorant of all this and really not a natural pet owner at all but determined to do right by them and make them a happy home...
After an extremely nervous start they will now feed from our hands which feels a major improvement.
Downstairs they're ok mostly I think; they have tunnels, a hidey box and various boxes to play in/with and they popcorn a bit which is adorable, although they do go completely bonkers every now and again and dash about as if they've been electrocuted 
They seem particularly wriggly and squeaky with each other when they are all in their sleep box upstairs and often one will come shooting out one of the doors looking a bit disgruntled as if she's been bullied out.
They're under a big-ish upturned shoe box with two doors cut out, filled with hay (fresh hay daily). But it could be that it's too small or too low for them and that's not helping them get on iyswim.
DH thinks I'm being ridiculous. Should I sort them out with three separate snuggly sleep house thingies for up there, or should they really be sleeping snuggled up together and we need to let them sort themselves out?
There is a genuine chance I am projecting other anxieties onto these poor guinea pigs but do please advise if you can, oh wise ones!