Just wondering how much you fellas pay for 20 gal tanks i think they are around 100$ aus dollars here. I have built a 50 gall tank and sump with bio filter including water pump and weir system for under 150$ aus dollars out of ply wood i have heaps of pics that are taken from start to finish just got to put them on. I have water proofed it and am just waiting for the day to finish so i can go home and put a bead of silicone around the edges, then 7 days later when the tank has fully cured start the cycling process.