Calfo Style overflow question

[rioratholenm]

I wanted to customize mynew 155. gal tank and put a Calfo style overflow. but i dont know how many holes i can safely put without stressing the glass and if i could achieve 3000 gal per hour using a sequence dart pump.
my tank is 48LX30ish-HX24W it has 1/2 inch glass

 

[jake2045]

I have three 1 1/2" holes in my 180, I don't know if you could get 3000 gph. Why not drill a 2" hole and use the Dart for a closed loop!

 

[rioratholenm]

NICE!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! Thank You

 

[WarrenG]

Is there any point in skimming off more water than your protein skimmer can process? I made a box overflow 7"x2" (18" of skimming surface) that drains through a single 1" bulkhead. 150gph is easy and only takes the top 1/16" to 1/8" of water from the tank. That's enough flow for a skimmer on your tank.

If you want more water to flow for use in a closed loop or other circulation it doesn't matter if that water comes from deeper in the tank since you're not able to skim it anyway.