Nutrafin cycle won't do a thing for cycling your tank. A waste of money IMO. The reason for this is that bacteria is living, think about it, living bacteria isn't going to sit for months on a room temperature store shelf and still be alive when you put it in your tank. The only bacteria supplements I've heard of actually working are ones that you buy refridgerated at the store and add immediately.
You really need to get your water tested, focus on your ammonia and nitrite levels. I would stop adding the nutrafin (maybe someone else can chime in here, is this one of the products that throws off test kits?). A basic water conditioner that removes chlorine and chloramines is fine.