Drilling tanks and have questions

[Beanz]

I have some questions about drilling tanks. I am wondering what kind of overflow would be best for the 15 gallon tank i have and the 45 i have. What size of holes would provide enough gph for these tanks. I am thinking of doing beananimal overflows for both tanks because they are in my bedroom and would like the overflows to be quiet. Would this be ok for such small tanks? I haven't seen them done on small tanks really. Also how close can you drill the holes together and how far should the be from the edges/sides of the tank?

[brotherd]

Hi! If you haven't yet ,you should check out glass holes.com. They are really helpfull.

[monocus]

i use a stockman overflow-1 hole to drill and are silent

[Beanz]

Hi! If you haven't yet ,you should check out glass holes.com. They are really helpfull.

Thanks for the link man, just wondering if you have one of the overflows that they make? If so how loud is it?