No & Yes.
When you have chloramine in your water, you use a product ( ie prime, safe) that breaks the chlorine ammonia bond and converts the ammonia to ammonium then the bacteria in your tank will consume and convert that so you will eventually have a 0 ammonia level.
Nitrifying bacteria will do better in higher PHs than lower. However, the plus side to the lower Ph is that when PH is under 6.8- 7.0 ammonia is converted to ammonium which is much less toxic to the fish and so with a lower PH, the need for nitrifying bacteria goes down. ( There's a much more technical explanation but this is the short version.
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Hope this helps.