sump

if i have a 150gallons tank would 40 gallon sump good enough ? am thinking thinking about down grade to 125.

Will it hold all of the equipment you'd like to put in it? If so, it's big enough. :D

FWIW, I have a 150G with a 40G sump and while I'd like it to be a bit bigger, it works just fine.
 
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