Guppies Quantity ?

[coolfishfan]

Hi All,
 
Just need to know how many Guppies(all males) can I keep in my aquariums ?
I dont want to overcrowd them with excess numbers.
I have two tanks :
1> 36*12*18 inches
2> 36*18*18 inches
 
Thanks.

 

[the_lock_man]

Obviously it depends on whether you want anything else in the tanks as well.
 
Assuming that you don't, the smaller one would take 12-15, whilst the larger one would take 20 or so.