worth

I have been wanting to get some more coral for my aquarium. Right now I have a Frogspawn with 3 heads and a Duncan coral with ~5 heads. The tank has been running for about 7 months. I have a Coral Beauty Angelfish but it does not seem to bother my corals. I found this and thought I might get it...

Hello, I found a tank--75 gallon--and I am just wondering what you all feel a used 75 gallon with stand is worth?*it is also 2.5 hrs away. The guy is willing to trade somethings...like my ps2 and some games for it, but is unable to meet half way.(he wanted 200 for it) i am adding some pictures...