Bulk head hole size compromising strength of tank?

mcox

New member
Planning on drilling 1/2" glass with 5 holes near the top back of tank. Hole size would be 2 3/8" each. I am wondering if this would compromise the strength of the glass enough to cause it to break. Also, if I put 2 additional holes about half way down the back panel 1/3 in from each side (same size holes as those at the top), would this compromise glass integrity? I am just trying to leave options open for enough future flow/closed loops if I decide to go that route. Windsor Aquatic, if you are out there, I would appreciate your take on it as well.
 
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