Do you have the other chicks in a brooder? If so you can place the peachick in with them and it should be fine. Be careful with the chick in a styrofoam incubator if that is what you have cause if it has a fan and no fan guard the chick can get caught in the fan and get scalped. The 2 week old chicks will actually get the pea to start eating and drinking in a couple days
Great catch and save of the little one