When buying and selling full set up tanks, is there a per gallon rule of thumb? For instance, if I were buying or selling a 35 gallon tank with heater, substrate, filter, et al, what is a reasonable price? I know it depends on a zillion things, condition and age of the tank, with or without fish, pick up or delivery, etc etc. I'm just looking for a market clearing price. Because I AM selling my tank (moving out of the country), and in 5-6 years I may be looking to buy a larger tank. Having absolutely no luck on Craigslist. Thanks all.