Give up. First of all, cutting acrylic plates requires a special machine. You can also cut by hand. The tool is called a hook knife, but it can only be used for thin plates of about 3 mm. Secondly, the glue used in acrylic is similar to 502, a quick-drying glue, which is difficult to control without leaking. So I suggest you buy a new glass fish tank. Super white ones are good.