20G sump help / first sump build

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Acipenser

Feeder Fish
MFK Member
Oct 16, 2008
144
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Port Moody B.C. Canada
I am trying to assemble this sump cheaply, I have picked up a used overflow box and a used Mag3 pump, I am buying a new 20G long tank.

My plan is to silicone in some acrilic dividers and use Ac110 sponges and pot scrubbies, I plan on using this as the main filter on my 125g tank It is filtered by 3 Ac110's at the moment .

I figure on getting aproximatley 2x - 3x turnover from the sump.

The 20G long is 30 inches long x 12 deep x 12 tall it is the largest foot print I can fit under my 125G, unless I buy 2 20G longs and drill them Hmm.

So if i estimate that I can get 300 gph at aproximatley a 4' head is the 20G tank big enough for a sump ? I am concerned it is not large enough . Or does it even matter how big the sump is as long as it does not overflow onto my floor ?
 
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