Hello,
Seastar is drillable on all panes.
If durso is 1.5" and feedline is 1" and you leave a decent space between holes for flanges and the walls of the overflow for flange space you need about 8" minimum inside overflow dimensions.
Keep in mind Sea star puts cleats on inside seams of alot of their tanks, also euro bracing.... these also influence sizes of overflows.
There is no more danger of flooding with internal vs external overflows, nor does the gallonage have to be decreased,likley it is just the opposite...instead of taking inside of tank space,youve actually added more. but yes, it will have to be placed further from the wall to accomadate them.
The best overflow possible is also the longest possible length of "spill over" with that in mind external can be done full length without taking any space at all from your reef.
Marc.
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