[Kristin]

 I find that they give you advice in order to make you want to buy stuff. as a beginner i was sucked into that alot, but now i just make them feel stupid by telling them nitrifying bacteria can not live in an environment without flowing water for moree than a couple hours let alone in a bottle on a shelf for 6 months. it doesn't work, but that doesn't mean you can't shop there. just ask us for all the advice and ignore his, because we won't try to sell you snake oils.