Hey man, first, I think it's important to understand that you are introducing your Nitrates. Nitrates are the product of your biological filtration process and occur naturally in our systems. Only, you are not being able to turn those into the last byproduct of your nitrogen cycle. Why? Because the bacteria that does this livesin the anoxic (no oxygen)areas of your aquarium. These areas include in the inner chambers of your rocks and in the deeper layers of a deep sand bed. If you don't have a lot of highly porous rock or a DSB (Deep Sand Bed) your system is ill equiped to perform this function. However, there are alternatives. In your case I would say more rock and/or a denitrator.
Chaeto will help but it can only do too much. Specially if it has to compete with a plant strain that has already taken hold in your tank.
The third and last thing I should say about Nitrates is that all food that doesn't get eaten will become Nitrates so a)do not overfeed, b)change your mechanical filter media often and c)make sure you don't have dead zones in the tank or at least vacuum them well at water changes.
If you do any or all of these, you will beat your trates in no time. A month in the life of a reef is a mere instant, so don't despair and keep at it.