I'm not giving it away, but if you want a BIG tank for $2.00 a gallon I have a 400 Gal.
400 Gallon Fiberglass Aquarium with glass front-
Overall dimensions are 106-1/4" long, 33-1/4" wide, 41-1/4" high.
Drilled for closed loop, 2" bulkheads (currently capped) four in the back, two in the bottom, two smaller bulkheads on right side. Built in overflow on left side-( I just took this apart on the outside of the tank-can be re-worked-or closed depending on your wants and needs).
Front is 3/4" glass, no big or noticeable scratches, and the viewing window is 90-1/4" long by 28-1/4" tall.
Exact inside dimensions are 100.5" L X 26.5" W X 41" High.
According to my quick math that comes out to 473.925 gallons,
but I never ran the tank filled to the brim. Using the built in overflow the total water depth is more like 36" (which because of the trim around the glass if you do run the tank at a full 41" you will be looking up at the surface of the water-could be a cool perspective-but that is up to the individual with the tank.
So at inside dimensions of 100.5" L X 26.5" W X 36" water depth my quick math gets me to 416.10 gallons.
Keep in mind this tank holds about 3,200 lbs. of water. Also, yes it is fiberglass, but I work in the aquaculture industry where we use high quality fiberglass tanks (some from Norway) and my boss says the quality of my tank is better than anything we have in our facility. I can send you a small sample of the pressured condensed fiberglass for $5, deducted from the tank price if you purchase. Tank can be viewed in person in Hampton, Va