made a 280gal and 160gal framed plywood tanks skinned with glassfiber,with they,re own custom filter systems.my growout at the mo is a b&q bath that was chipped got it for nothing,cut a 3x1 foot hole in side ,reinforced and siliconed a window in.plumbed in bottom drain with slide valve,overflow for constant drip water change.also made a concrete 1800 gal tank with 3 windows,filter systen made from 2 x200gal plastic tanks fed by 2x4foot 4" dia airlifts.water returned via 2x 6" dia pipeswith fiberglass diy tank connectors
DIY,s great
