Hi Bro
On your initial query - that size can easily house up to 15 or so adult aros.
My 7 x 2.5 x 2.5 housed 7 aros reasonably comfortable.
If I may say, unless you have natural light source, artificial tanning for reds is going to be challenging with a depth of 2.5 ft. Understandably, any lower would make the tank look a bit slender/long.
Cheerz
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