I see a lot of algae and some BIG aiptasia, so I have to imagine they are on the verge of taking over the tank. IMHO you'd be better passing on that, I agree with Mac hat it's way better to build your own tank then take someone else's. You don't know how they ran there system or what they put into the tank that might cause you problems. You can pick up a 20 long from petco for $20 right now, which is a nice easy starter tank and build your own, which you will enjoy a lot more than cleaning up this persons mistakes. Just my $.02