I've got a 10 gallon tank on a piano bench in the room the cats are banned from (also home to the birds). Perfect fit! But measure if it's one you'd have to buy. Mine I picked up free and used as a small cofee table for years in front of a futon. Multi purpose!
some TV stands can for well for 20H and below tanks.
the best ones dont have "feet" or "legs" like other furniture. the entire base is touching the floor, which spreads out the weight better. also look for plenty of support pieces (ones that go from the top of the stand striagt to the bottom)