Hello Julie Thorns and Welcome

to Fish Lore. So sorry to hear about your fish loss and issues. I see in your aquarium information that you are unaware of the
nitrogen cycle that is crucial to fish keeping. Link below:
The Aquarium Nitrogen Cycle
Read it over and when you have questions by all means ask. I have a feeling your tank may be dealing with
ammonia issues seeing that it has only been set up for one month.
Can you post readings for ammonia,
nitrite and
nitrate levels?
I would suggest at this point doing a 50%
water change, add some Prime or Amquel + just in case you do have ammonia issues. The Prime and Amquel + will detox the ammonia for 24 hours.
Test Kits: What is most recommended is the
API (liquid) Master
test kit. This kit will test for everything mentioned in the Nitrogen Cycle link.
Best of luck and keep us updated.
Ken
