How many holes can i Drill?????

How many holes can i drill into the back of a 120 long AGA?????

 

Nevermind...i got this

 

LOL how many do you want to drill ? I'd stop short of a new bit

 

Now it doesnt even apply because my tank plans keep suddenly changing....My acrylic dude just called and told me too call on tuesday with my tank specifications....im just gonna have him drill the holes.....One thing is
He wants to know is what the turnover rate is gonna be from sump to display not including my closed loop so he can figure out how to do the overflow.......What do you think would be a good turnover rate for a 150 gallon??? (Sps and clam tank) (4 way oceans motions for CL)

 

Well that all depends of you overflows on average I shoot for 4 to 5 times through the sump your open loop has no bearings of the flow rate as it should have nothing to do with the sump. 150 gal. tank you need to shoot about 700 GPH through the sump and past the skimmer. The open loop hell as much as you want to I'd use a good high volume pump