Thank you. Around what dimensions would a 300 gal be? Just so I can measure it outany hardware store generally. The term weld here is...similar but not quite the same as what you are thinking. Weld-on 40 chemically welds acrylic panels together, all you have to do is mix it up and bead it on the area the two panels will meet and clamp them together. After that you can tip the tank up and pour more into the corner of the panels creating a much stronger bond.