I'm thinking it says newbie 'cause you only have 4 posts - but that's just a guess.
You might want to post in the "DIY" section. You're going to get a lot more help there on this, versus posting it in "Buy-Sell-Trade" section.
DIY section is here: http://www.aquariumadvice.com/forums/f20/
[Edit: Oops... looks like you already found that section and posted it there! Nevermind...]