You need to tell us what type of cuttle first before advice can be given on temperature.
As for feeding, you need to try an replicate the natural diets which is mainly custeaceans and fish. So go for river shrimp/tidal shrimp, crabs, marine fish, feeder fish like salt water millies etc.
Lots are moving onto frozen food now, this being easier to obtain, cheaper often, and disease free, although it can take some time to get them used to the idea.
HTH