Welcome to FishLore

What are the readings for ammonia and nitrate? It would be a good idea to have a
nitrite test.
With out knowing all 3 readings, it would be hard to recommend if you can add anything yet.

In your aquarium info, it says you don't have any fish, but in your first post you said you have guppies?
How long has the tank been set up?
If you could fill in more of your aquarium info (Under My Settings at the top left), the members can help you further without having to ask a bunch of questions.
Good luck
