Thanks Bax!
I've done some major changes to my overflow mesh. Here's the detailed process.
Originally my overflow had black eggcrate across the top to keep things out. However I had some bad experiences with picking clownfish out of my overflow downstairs (50g) as they were small enough to fit through. (as well as a few small hermit crabs)
Original:
So the solution was to make the holes smaller using this:
I tried this downstairs (50g) first and it worked well, so I proceeded to do the same on the 180g.
I did this before even running the tank with water so I never though any more about it, looked like it was well fixed. Then one day I happened to lightly bump one of the eggcrate meshs and it just tumbled of like it was just sitting there... Upon further inspection all the eggcrate came off with ease. Somehow the epoxy used to hold it in place just came right off. I wasn't too upset as I never really like the eggcrate to begin with so I went searching for an alternative.
Acrylic Overflow Teeth. This was it, definately a better choice and I wish I would have went this way from the start. I contacted Mako56 as I seen he had made some of his own, and he was generous enough to whip me up a set. After getting them I took the hacksaw and dremel to them in order to make them a precise fit, and it turned out great.
Siliconing them in place:
I'm super happy with them, and I think they work much better overall. We'll see.