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What type of glass is used to make the sections of the sump? Is it just regular window panes or is it precut tempered glass? I tried to build one once upon a time with plexiglass and the sections bowed and eventually failed. Anyhelp would be appriciated.
If it's a small sump you can get be with the thin glass from Lowe's. But going to a glass shop for 1/4" glass would be best. It doesn't have to be tempered glass.
When I built the 20L sumps for my tanks, I actually brought the tank to the glass shop and left it with them to cut and fit the glass. I used 1/4" on both of them.