How much does it cost to have a tank?

[hamsik97]

I wasn't even considering buying anything new, including livestock, all used. Everytime I see someone selling two clowns for like $25 I wanna run and grab them. So I was going to spend like $300 on a used tank with everything in it and sloooowly fill it with "used" fish and corals. But when people say they spent $125 per month on salt and filters.... yeah, too much for me.
Quite a few people said I should get a 55-65 gal tank because it's easier to maintain.
Jenna