Button Quail flooring space?

[s_and_ke]

I am keeping button quail and would like advice on floor space needed per bird for button quail. It seems to be the only thing I find no mention of online. I currently have one pair in a 91 qt sterilite tub I changed the lid to accomidate them. I cut out two "windows" and covered with nylon netting. In the middle I cut out a door in the roof so I could reach in to feed and spot clean. I also put a round hole in the lid to hold the test tube style waterer I got for them. I can take pics if anyone is interested or if it would help. I just want to be sure I do not crowd as I plan to get more. And to hatch eggs.

Thank you for any advice and info!