tank price?

I have a friend that wants to sell me a tank 120gal glass, filters, 50lbs of lava rock and a box of stuff it was a freash water not sure what all comes with is yet going over to see it this week but my question is what do you guys think the tank is worth?

Copper can be cleansed from an old used tank before being set up, ime.

how is the best way to make sure that a tank that may or may not have had copper in it, is cleaned of it before use??

Thanxs he say it never had copper but he got it in trade for some taxidermy he did. no stand no hood. all the stuff that was used for freshwater i will not be using. from what he discribed it has a wetdry filter and some kind of pump. i'll be going to check it out tommarow.

Copper can bind to both carbonates and silicates (glass).  The bond with silicates could be too strong for the acetic acid (vinegar).  The HCl is just a much stronger acid.  The bleach is to remove stubborn organic deposits that a strong acid will not remove.  Copper is often complexed with these organics.  That is my reasoning for using them.  The method I posted is what I do but I am certainly willing to admit it might be overkill.  Heck, vinegar alone might be overkill .  But it's a very easy and cheap process to do (if anyone needs some HCl, let me know, I can give you enough to clean your tank... you're on your own for the chlorox).  Alternately, muriatic acid can be found at home depot and pool/spa supply stores...