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					Originally Posted by  GMGQ
					 
				 
				Drilled = 100% flood safe 
External Overflow = Not 100% flood safe 
 
Valid arguments for both, they both can fail if clogged obviously.   
 
But the External Overflow can also fail if it loses it's syphon when trying to restart after a power outtage. 
 
I regret having an external overflow, it's a constant fear of flooding (happened a few times).  I wont make that mistake for the next tank. 
 
Regarding the sump, you would want a sump from the start.  That's where you keep all the equipment (protein skimmer, heater, filter socks, media reactor, maybe a section for chaeto, etc.). 
			
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 LOL...
My friend, I live in no such fear.
You must have one of those CPR units...lol
And you realize you just stated that neither format is actually 100% flood proof right?
Go with a Life Reef or similar.
Again, 6 years, no breaks in siphon, no floods and probably 100 power outages .