I'm new and have a question...or two

[MikeP]

I've read a few things about people having nitrate problems, how can I make sure I'm not one of them? I intend to do frequent water changes and I use 'prime' water conditioner which is supposed to remove chlorine, chloramine, and ammonia and detoxify nitrite and nitrate at every water change. Is that enough to keep things in check? Is there any filter media that I should use? Right now I've just got foam, carbon, and bio spheres. I'm foing to start with a couple of clowns and if all goes well I will get a blue damsel. How long should I wait to get some sort of 'cleaner' like a cool shrimp or something? Another thing I wanted to ask about was iodine? Some guy at petcetera told me I need iodine if I'm going to keep any sort of invertabrates. He didn't really seem like he knew exactly what he was talking about. But here I am research, research, research right?

Thanks for any help