im in the same boat as you with wanting to make my own. if you look up "pressure locking baffles" on google you can find a DIY sump that shouldnt cost more than 50 total.
$20 tank
$20 in acrylic
$10 in weatherstripping and sealing materials.
I have a 72 gal tank and im about to make a 20gal Long sump.






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