If you're planning on growing phals in your container, you probably ought to think about the mini phals as the spike on most standards is going to be taller than 24 inches.
I grow all my phals on windowsils, for me that's the perfect indoor set up.
Joann
As Joann said, for that size container, you should probably stick with mini's. Air flow is very important. You'll need a small fan as air in a container doesn't have enough movement to do any good without a fan.
Al, ........been there, done that.