Hugo,
Having an entirely open top with no bracing is really nice. I had a 3" Acrylic lip put around the top of the tank to keep the steel frame from being in contact in the water. I definitely recommend the lip. When you are working in the tank it prevents splashing the water out of the tank.
Also make sure that the frame is properly powdercoated to protect it from rusting.
Dave B
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560g Display. 1500g System Volume. (2) 180g Outdoor Frag Tanks. 340g Sump, 30g 2 story surge tank. Dasatco EXT 9. Bubble King Skimmer. Ozone. UV. 5' Fluidized Sand Filter. Avast Kalk Mixer.
Current Tank Info: 560g SPS Dominant Reef / 1500g Total System
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