So i have a 518 gallon tank that i have just finished fixin up and i put it on buy and sell and craiglist to see what i could get for it i put it up for $2000 bucks and have got a couple offers including a trade for a UCK registered blue pitbull puppy that sells for between 2000 and 3500 us anyone think this is a good trade or if $2000 is a good price?