You know what? My joey's are really crabby at the minute too - I don't think I've ever had such grumps!!
I'd keep an eye on their weights, weigh them every other day just to make sure they're BOTH gaining, and have a good look at the quieter one daily to check there's no more cuts or bites. I'd put another pouch in TBH, and don't be too alarmed if you find the joey's in one pouch and the parents in the other. The reason I hand reared Lily and Molly is because I found them in a different pouch on their own and crying, so I immediately thought they'd been thrown out, I since discovered that this is how that particular ffemale is, she left another pair of twins but I decided I was going to leave them for an hour or two and see what happened, half an hour later mum bundled them up and took them to the main pouch. This is natural, rejected joey's are usually thrown out, not placed in another nest. Wild suggies have around 5 different dens and they will sometimes use a different den as a creche while the others go out feeding, they usually leave an adult with them but bear in mind they're outside.
Whatever you decide to do keep a close eye
