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· I Have No Fish but I Have Japanese Girls On My Ava
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Sir Nathan XXI said:
predrilled means the tank has holes drilled in the glass, usually the bottom, then a wall like a dam is build around that to maintain tank water height, one hole if for a drain the other is for your water return line, this setup is to connect to sump filters,

here is a pic of it


pic is from all-glass.com
I wouldn't/couldn't have explained it better.
 
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