Alot of old T.V. stands were made to hold alot of weight. Some of those T.V.'s were extreemly heavy, but a 75g tank full with water and accessories will be over 700 lbs. If I were you i'd just make sure you had exact measurements for tank and stand. Most wont be big enough for a tank that size, you might need to reinforce the top with 2x4's or some thick plywood so you don't have the tank hanging over the sides.
Saw this in a cartoon once, think I can pull it off!
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