Hi Melissa welcome to Fish Lore
I moved your post to a thread of it's own so the members can help you.
I'm sorry about your fish, I know it stinks to lose them.
Here's a great link to get you started:
Freshwater Aquarium Fish Beginner's Guide
Pay close attention to the
nitrogen cycle information.
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 50% daily water changes.
Using Prime 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.
When's the last time you changed the water?
Oh, avoid the test strips, they can be inaccurate. The
API master test kit is a liquid kit and very reliable.
After you test your water, you can post the results and we can help you further.
For
ICH, you can slowly raise the temp to 84F. Increase aeration to make up for less oxygen in warmer water. Leave it there for at least 2 weeks. Thoroughly vacuum your gravel to pick up all the ich spores.
If it's really bad, you might want to medicate.