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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Gary
Tank was up for 7yrs and 10months. Thanks Everyone!
2016/2017 180Gallon Build Coming Soon...
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