What size air pump and air stone for 55 gallon?

[RackinRocky]

I think I'm going to go with a Million air pump, after reading reviews, but what size would I need for a 55 gallon? Also, what size air stone should I get? I have an air stone that comes with the Hagan battery operated pump, but would that be too small? Thank you!

 

[Yorg]

Hi seaecho:

What is the air stone for? Is it primarily for decoration or general aeration, or will you be using it to run a filter (undergravel, box/corner, etc.)?

-Yorg

I think I'm going to go with a Million air pump, after reading reviews, but what size would I need for a 55 gallon? Also, what size air stone should I get? I have an air stone that comes with the Hagan battery operated pump, but would that be too small? Thank you!