I have a DIY project that is all acrylic and needs to be reef safe. I want the best and strongest epoxy or glue for acrylic structures that is reef safe.
Don't use epoxy, use Weldon 3 or 4 as suggested above. If you haven't glued acrylic before, take a look at a few youtube videos to get an idea how it's done. Pretty simple, but there are definitely some techniques to make your seams much nicer.