Drain and Return hole size

[Creative248]

Good evening everyone
I was wondering if any one would be able to help me on the size Bulkheads i need for a 150 Gallon saltwater tank .Fish,some live rock ,

 

[mcgyvr]

Sure...
Can you give us details on..
#1-type of overflow the tank has or will get?
#2-return pump model?

A "general" suggestion for a 150G may be 3 x 1.5" bulkheads if doing a bean animal (and you should).. 3 x 1" may be ok too depending on the return pump flow..
http://www.beananimal.com/projects/silent-and-fail-safe-aquarium-overflow-system.aspx

 

[Creative248]

I will drill the bottom of the tank .Not sure if i should put a return and a drain on each side or a return on one side and a Drain on the other.I can not do a bean animal system as i do not have the room for much of anything on the back .