I would recommend separating them. You will probably find Peggy and pip are both far happier apart, as well as the fact you can create a stronger bond with them both! If you are thinking of rehoming both of them because you want to keep two together, hamster keeping might not be for you. Even highly experienced owners can struggle with keeping pairs or groups, and you must always always always put the hamsters needs first. Right now they are both probably very stressed, even if you can't see it, and it's kinder to them to separate them. Stress weakens their immune systems and puts them at risk of illness or death, add that to the potential of one traumatically murdering or severely injuring the other and the 'pros' of keeping them together just are not worth it.
The fact that you have come to a forum for advice is great! It shows you want to do right by your hams, don't feel too disheartened, we all human and make mistakes. Use the advice given to grow as a pet owner and improve the care you can give to your animals
