I would not use super glue on acrylic. It doesn't stick well without a special primer and it won't add anything to the process. The silicone by itself will work fine if you use thick enough stock and put it on both sides.Do you think applying reef superglue (I m not sure if regular superglue is safe) to the acrylic and tank, and then siliconing it would secure them a bit more? Maybe also scuffing the edge of the acrylic to create a better bond? Just got the acrylic sheets in and a laser cutter that I haven’t tried yet.
I’m super lucky my dad owns a construction shop/warehouse that he lets me use for my projects
Here’s the finished glass sump I made, I’m thinking I might need a brace in the middle after I add the baffles. I have a stainless steel frame on it, the top I covered it with a thin plastic border and the bottom I coated it in a marine primer, I might paint it black to match.
You can Google aquarium glass safety calculator if concerned about your sump. Ideally you want a safety factor of 7 or greater. Good luck!!