This may not be relevant any longer, but if you still haven't put anything into the tank, you might want to try a product called "Kaboom." Its pretty strong stuff meant to get red of lime/rust/etc in bathrooms, etc. I used it successfully to remove hazyness off of a 5 gallon that I had tried many other products on to no avail. Be sure to rinse out the aquarium VERY VERY well afterwards however.
-Jeremiah
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