- That style tank is called a "Flat Back Hexagon Aquarium" It's not custom, it's a standard factory size.
Brand new they're about $1000 before shipping costs are added. Check with the seller to see if the dual column stand is included. If not, whatever you plan on using has make "full contact" with the entire bottom of the tank, not just the edges.
Going to be tough to move with all that gravel & plants in there. Even with 85% of the water drained it's going to be HEAVY.
[*]Research "crazing acrylic" & memorize the images before you view/buy this tank.
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Price is good if it is a complete setup with the canister filter, light, heater & canopy.
Good luck.