Haz111,
I don’t want to be the one to rain on your parade but it really doesn’t sound good. The green stuff is bile and it sounds like the liver has gone into overdrive producing it in response to the large amounts of fat that are probably deposited in and around it and other organs. When it gets to the stage where the amount of bile produced is effectively creating diarrhoea, then that is quite serious and probably terminal.
That said, their may, in fact be other reasons for the liver to be producing excess bile, including bacterial infection, which is a lot of the reason the vet prescribed antibiotics. So my advice would be to hope for the best but at the same time prepare yourself for the worst case scenario too. Bear in mind I am not a vet and I have not examined the animal.
NATO Black-headeds are the most susceptible, followed by the woma and then the carpet. From memory, Aspidites consume around 60% reptiles and 40% small mammals with the odd unlucky bird.
Size wise, rats no bigger than 180 g or so should be offered. Suprisingly, mature male rats are a lot fattier than mature females. Native and wild rodents do not tend to have much in the way of fat reserves due to the nature of the seeds they feed on and the amount of travelling they have to do on a regular basis to find food.
By the way, you did the absolute right thing in getting it to the vet straight up. It also pays to locate a vet who is experienced in treating reptiles. There was a thread on that at one stage, if memory serves ne correctly.
Fingers crossed,
Blue