I agree with taking all the livestock back and starting over. You never cycled the tank. Check out the articles at this site to find out more about it.You can't just fill a tank with salt water and let it sit for two weeks and start adding livestock. I'm pretty sure your starfish will die with the course you're on.
Read here and on the internet a lot more. Do not. I repeat, do not rely on that lfs for any more information. I can't believe they've been advising you on the things they've told you and let you buy so far.
Asking hoow to get rid of nitrites tells me you have no idea what a "cycle" is. Knowing that is HUGE for what you're attempting to do.
By the way, any chance of at least a 30g tank? As Mike said, in a small tank like yours, things can go south REAL quick.
And of course, my manners.... Welcome to AA!
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