I have a baby catfish in 10 to 15 gallon tank?

So today i found a little baby catfish in a creek slow moving at the most part and i took it to my house and put it into a tank with other fish. I have a whole bunch of quenstions. one is what do i feed it second will it survive in the tank, should it be in a tank alone, and should i maybe just go put it back in the creek please and my question i dont want the little thing to die maybe like an inch big or a little bit smaller thanks