I h ave a arboreal salamander and a California newt in the same tank with a piece of driftwood and about a inch of water. I caught them both in the wild. Ive had them for about a week and i have been giving them tropical fish flakes. (I have tropical fish too). I was wondering if they will eat this and what the tank set up should be and how to care for these guys. I was also wondering if the California newt could harm me because i know that some people were killed when they swallow it. Thanks for the help

you should let them go. They should not be in the same tank together and are going to need 2 totally different setups, temps, humidity levels, etc. You are also feeding them the wrong thing. They need live food, but the ones outside usually have parasites or traces of fertilizer.
I have also heard about frogs releasing toxins from their skin in the wild, but store bought ones born into captivity do not produce these toxins. Im not sure if this is true with salamanders and newts, but its better safe than sorry.
A lot of wild animals dont do well in captivity and will sometimes starve to death or die from stress. I think it is best that you let both of them go, especially if they havent eaten anything yet. Go to the petstore and get a tiger salamandar if you really wanted one. I have heard that they can be pretty docile.
IF however, you dont choose to let them go ( bad choice in my opinion), I would go to repticzone.com and look at the caresheets they have on these animals. They will tell you the correct setups and stuff for them