Hmmm, not sure about that footprint being comparable to a 75G rectangle. Even in a 55G each male would have a 12" x 12" square he could claim. I don't think you can get that out of the triangle shape with longest dimension being 48". You are sort of chopping off the back corners of a 48" rectangle.
Or the other way you can picture it is half of a 34" cube cut diagonally.
My hara are pretty aggressive and definitely big. I sold a male not even 2 years old that was over 5 inches.
Yeah, it's a different shape, but it actually works out to a slightly larger surface area than a 75g but I suppose shape should be taken into consideration.
White top hara, one of the few large cyno's, my bad