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#11
04-15-2009, 02:42 PM
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Nope external overflows are fine, I know the "limitations" on drilling the smaller thinner glassed tanks (never had any success myself). As long as the tank itself is 20g or less I would imagine it would be ok, the overflow could be considered part of the sump or just another piece of equipment much like a hang on skimmer or something.
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