I don't have a corner or cube. But I have a 75 gallon AGA reef ready with stand, canopy, and a modified Aqueon proflex model 4 sump. Sump has 4 chambers instead of three, skimmer goes where refugium chamber was, 333rd chamber divided for refugium and return. 75 has a 2 piece glass brace that still allows for glass or screen tops. The brace is made of two pieces of 1/4 inch glass, main piece is 4 inches wide with a 2 inch wide piece siliconed to the main piece, and then siliconed to the tank. Had up and running for at least 8 months before taking a break from the hobby. I resealed the tank and it say for at least 3-4 months before ever getting water in it so the silicone strengthened up more