for the temperatures... make sure you have a reliable heat gun or probe that you trust is acurate..
ambiant should be 80 ish and the baskin spot 88-92...
usually with ceramic heat imitters you would have a controller with a probe that shuts it off when it reches the set point.. this is why i say make sure you have a reliable source to check the temps.. a 150w heat source on all the time could get to warm overall.. and being in a fish tank with a screen top, it creates a chimeney effect where all the humidity is sucked out..
as for feeding, you have nothing to lose by trying a rat pinky if the snake is big enough, it's the only way to know if it will take or not..
I myself would first feed it the same thing it's been fed just to illiminate any additional stress from the move.. if it eats and all is good, then try a rat.. if it doesn't want the rat !!! try rubbing the pinky rat on mice for smell transfer.. this trick works most of the time.. i would personally avoid quail and go for rats instead..
since it's so young and only had a couple meals... the important thing now is that the snake eats... if it doesn't want rats right away and it's picky..feed it mice then hopper mice until it's put on some weight.. then you can start the task of switching it but going a few weeks between feedings... BUT make sure it's had many feeding before doing that.. you wnat it to be a reliable feeder first.
another trick would be to feed it two smaller prey items, the first beeing the mouse and when it's almost got it down follow with a small rat pinky.. but do this when the snake has eaten multiple meals.
I would offer a mouse first after the snake has settle in for a few days to a week.. then if it eats it, offer a small rat pinky in 5-7 days.. if it takes it
perfect kep feeding them every 5-7 days for a few months after a good1 2-15 meals i then go 7 -10 days closer to the 7-8 and let it grow .
if it doesn't take rats.. kep feeding mice for another 10-12 meals while trying a rat here and there !!! you never know.. if picky. try rubbing the rat on a mouse if it doesn't work after a short while. leave the snake alone and try the following week doing the same thing.. with luck it will switch over..
if it doesn't try the double prey trick with smaller items..
more tricks out there but let us know how it goes and we can help from there..
best of luck
Steph