listen, he is proboboly fine. The water is cloudy because you just started something called the nitrogen cycle.
DO NOT put any "medicine/salt" into the tank right now you are probobly killing him. Try to get blood worms into a turkey baster and then squeeze them out of the baster right in front of him. I don't think you should be feeding him shrimp, I would stick to food designed specifically for ADF's and bloodworms.
You can add a few tankmates, like more ADF's, some shrimp, and many different types of fish. Feel free to ask if you have anymore questions.
ps. Good job so far by not skimping out on equipment for the tank, make sure that you keep up with maintence and you should be fine!