cracked

Hey guys. So, as some of you may know, I cracked the bottom panel of my recently bought 240Gal tank. I need your opinions guys on fixing it. The tanks is built with 3 pieces; the front and sides is one whole piece, the back panel, and the bottom panel. The front and back are 20mm so I'm assuming...

We have been given a tank with a cracked base. Considering im relatively handy is there any cheap and effective way of repairing?