Okay so Im picking up a 150g tank tomorrow the guy had a salwater set up in it. for an extra $50 he said hed give me both his filter and both his heaters and some extras. my question is if I set these filters on my tank do I have to replace the media in them? or will they be okay? and second the heaters, do I have to clean them before I put them in the tank? and my last question is, do I have to clean the inside of the tank and if I do what should I use?