This guy's near me is selling a 180g clarity acrylic with stand for 600. Another guys for same price has a 165g glass with stand and fx5. Are either these good deals?
I'd never pay the same price for something used that I could spend for something new.
1) I can more easily return new items that are defective since laws cover that much better than used items; over and above commercial and merchandise laws, simple credit card transactions can be easily reversed up to a point
2) I don't know how old the used item is and the seller of a used item may not even be liable if he lies, therefore I have no way to judge how long it may last
3) the seller of something used has an incentive to hide defects, while the seller of something new has an incentive to disclose them since it can be financially liable for more than the price of the tank if it knows there are significant defects and doesn't disclose them
For me, used needs a deep discount; but that's me.