Something you could try is to secure a straight edge like 2x4 to the tank then run you cir. saw down that. That way you are not free hading it.
Or go with a real deep sand bed or a plenum to make up some of he heaght. The only problem I see with the heaight that tall is lighting. Goodluck and let us know what you do.
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Honey, can I have a bigger one please? This is the last time I will upsize, I promise!
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