Hi Meg, welcome to Fish Lore

I answered in your other post, but didn't know if you had fish.
It would be a good idea to read this:
nitrogen cycle
Here's a basic explanation of the nitrogen cycle:
First your
ammonia (from fish waste and left over food) will rise.
In a few weeks bacteria will start to develop and you'll see the
nitrite levels rise and the ammonia levels start to drop.
After a few more weeks a different kind of bacteria begins to develop and you'll see the
nitrate levels rise and the nitrite levels drop.
Ammonia and nitrites are toxic to your fish.
So until your cycle is complete, you need to keep the levels down with daily water changes.
Using prime or Stress Coat+ as your water conditioner will detox the ammonia for 24 hrs between water changes.
When you having readings of 0 on both ammonia and nitrites with some nitrates showing, your cycle is done.
I'm going to merge your threads, it'll be easier for you and the other members to keep suggestions and advice about your cycle in one place.