There are several things which must be done tomorrow to ensure that Murphy is happy.
Firstly gerbs MUST have company, to keep one alone will mean it is depressed and lonely, if you go back tomorrow and get him a tankmate (same sex) they should go back together just fine.
Secondly they must not live in hamster cages, they need to live in tanks, in cages they cannot dig as they love to and will chew tha bars resulting in sore infected noses. They must also not have any plastic toys as they will chew them and it can cause a fatal impaction.
Britt, I wrote the aboce before reading your PM, thankyou so much for asking me to help advice you for Murphy
Yes males do need company, they can live male male, male female or female female. Of these pairings male male is the easiest and most stable as female gerbils can be rather aggressive!! As Murphy is still young he should readily, and joyfully, accept a companion without the need for a split cage but this needs to be done asap.
I know he couldn't be in better handsso best wishes to you both
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