what is a good stocking rule for a tank with only guppies?

[maxwellag]

I know that stocking levels vary on species and stuff, but I was just wondering what a good rule of thumb was...

 

[maxwellag]

Oops, I accidentally made two... mods please delete this one and keep the other one. Sorry about this, my phone said contacting remote site constantly so I pressed the back button and tried it again, but it must have worked the first time...