The crown serves 2 purposes though.
1. The tank is custom built and was meant to have a rim around the top to support the glass from bowing out when water is added to it. This rim will support that without a problem.
2. If at any time I decide to put in a goby of any kind, which are all known to be jumpers, I will need some sort of top. This is designed so I can put in screening and it will not show at the top of the tank. I have seen tanks with screen framing that you can see and it shows the salt creep too much and would have to be cleaned off almost daily. In my opinion, this is easier to maintain the "clean" look.