Yep that would be ok but you don’t need the depth to much it also makes maintenance harder. I my self would go for 7ftx3ftx20" but the bigger the better. But as Mentzer said if you can go for a 84" Long x 36" Wide x 24" that would be cool the last 6ft I had made I went for 20” depth trying to put your hand in a tank with a hungry aggressive red is not fun.