Search had multiple ways, but thought I would ask - tank is acrylic 6' x 22" x 12" with 11/16" acrylic. Has a single overflow in the corner, but drilled through the bottom which will not work due to the 2x4s in the stand. Was going to drill through the back with an elbow to put the drain in, but is it better to use a piece of acrylic with glue/sealant or a piece of glass with silicone to cover the hole and how thick
? I can't cap the bulkhead without drilling out part of the stand to accommodate the bulkhead.