Too many holes?

[Ratpack]

I have a 75 gallon tank I am working on and my plan is to run a closed loop on it. To do this as well as the overflow, I need to drill 5 holes for 1 1/2" bulkheads. The closest that any two holes will be is 8" apart. Three will be near the bottom and two closer to the top. None will be any closer to a glass edge than 4". Just curious if anyone thought this would be too much before I break out my drill and go to cutting.

Thanks!!

[Nemeth21]

Go for it.
I did a closed loop on a 70 cube. The only difference I installed 1 inch bulk heads not 1 1/2".
I think the (4) 1 1/2" returns is a bit of an overkill, but it can be done.
Jon

[Ratpack]

Actually only 2 of the bulkheads are for returns. Two are for the CLS intakes and one for the overflow to the sump. There will be other CLS returns but not drilled into the tank. The two that are drilled will be for 90's that direct flow directly at the bottom to blow all detritus off the bottom since it will be a bare bottom tank. Then there will be 4 other top mounted returns for creating flow in the tank.