Ok... Guys..
I just noticed today that my tank is turning a yellowish color and is smelling pretty bad...

What should I do? Should I empty all the grose water out?

I had it set up again since about a week ago, and it seems like its not getting any better...

I can post a pic later on when i get home.. this is really bugging me.. this is the first time ive had a real fish tank and I just want it to look pretty but ive had nothing but problems with it..