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Since it's not entirely clear to me (seems to be leaning more towards a reef based on the frag rack mention though)
For a FOWLR I would go ahead and do something like a 78"L (your mentioned 6'6) x24"W (maxed out width from statement) x30"H since reaching into the tank won't be that frequent in a FOWLR.
Do note that with a 30" high tank you will definitely need thicker than 1/2" to sleep well at night
If this is planned to be a reef tank then 72x24x24 would be just fine at 1/2" and will be easier to light than say a 78". Even more so with euro bracing on the bottom and top (highly recommended regardless of which direction you go)
Assuming you could possibly budge on the width and go with 30" then that does open up the cheap and easy sump options a lot more with widely available standard 100 gallon tanks or even 150 gallon tanks (usually 60x18x24/60x24x24 respectively) while leaving a decent amount of room in the front for miscellaneous items you may stick in there.
For an overflow, the largest external overflow with 3+ holes would be idea if it causes no issues with you getting it down into the basement (very important and something you shouldnt forget!!) but keep in mind that any gate valves you will be using on said overflow configuration needs to be readily accessible for you to make adjustments.
If that's not an option then losing some real estate in the tank for some corner/a centered (on the back) overflow may be more ideal options. Fortunately you can still do herbie/bean style drains on them.
TLDR; 78x24x30 if fowlr, 72x24x24 if reef, external overflow > internal unless space restrictions + euro braced top + euro braced interior for maximum strength
For a FOWLR I would go ahead and do something like a 78"L (your mentioned 6'6) x24"W (maxed out width from statement) x30"H since reaching into the tank won't be that frequent in a FOWLR.
Do note that with a 30" high tank you will definitely need thicker than 1/2" to sleep well at night
If this is planned to be a reef tank then 72x24x24 would be just fine at 1/2" and will be easier to light than say a 78". Even more so with euro bracing on the bottom and top (highly recommended regardless of which direction you go)
Assuming you could possibly budge on the width and go with 30" then that does open up the cheap and easy sump options a lot more with widely available standard 100 gallon tanks or even 150 gallon tanks (usually 60x18x24/60x24x24 respectively) while leaving a decent amount of room in the front for miscellaneous items you may stick in there.
For an overflow, the largest external overflow with 3+ holes would be idea if it causes no issues with you getting it down into the basement (very important and something you shouldnt forget!!) but keep in mind that any gate valves you will be using on said overflow configuration needs to be readily accessible for you to make adjustments.
If that's not an option then losing some real estate in the tank for some corner/a centered (on the back) overflow may be more ideal options. Fortunately you can still do herbie/bean style drains on them.
TLDR; 78x24x30 if fowlr, 72x24x24 if reef, external overflow > internal unless space restrictions + euro braced top + euro braced interior for maximum strength