I do agree though, if you're using LR, you really don't need to dose ammonia. Either the LR is going to give you the ammonia you need to start the cycle, or the LR is going to be cured already and it'll likely have enough bacteria on it so you won't have much of a cycle. If you wanted to, you could dose just a small amount and see if it results in an ammonia reading or a nitrate reading. Like everyone else has said, you can also use fish food to do this.