Which overflow?

[Aqua_expert19]

I have a 180Gal and want to setup a bean animal.

I was originally looking at Synergy Reef but reading there were a decent amount of unhappy people.

So my options are

Synergy Reef
Fiji Cube
Modular Marine
Exotic Marine
Eshopps

any others? I am a little worried about the ones that use the removeable inside overflow part because if water can get passed the overflow inserts then if power goes out I could see it draining 5" of water in my tank which is around 40G which I dont think my sump can support

Thanks,

 

[Dan.]

1600GPH Fiji Cube here, great product.