What do you mean by ammonia and nitrates "almost" undetectable? If you are getting ammonia readings then your tank is going through a cycle and is probably caused by moving your rockwork and disturbing the sand bed. Water changes and running carbon will definately help in that case. OTOH if it is something with your salt mix or source water then you are only going to make things worse. Running carbon definately won't hurt and if possible try running it in a canister filter of some kind and change every day for a week or so. You really need to get some test kits and also post what actual reading you are getting for ammonia etc.
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