How can I get down my Nitrite and Nitrate?
It tells me in the book to get API Nitra-Zorb. If I do get this, where does it go in my filter?
The tank isn't cycled; you should have 0 ammonia and 0 nitrites when it is. The best way to reduce nitrates (and at this point, the other two) is frequent 20-25% water changes (every day or every other day) until the nitrates are down below 20.
Nitra-Zorb would be a short-term fix, and yes, it goes into your filter. But frequent water changes are your best course of action.
You could also add live plants to use the Nitrates
I currently have five live plants, and 2 days ago done pretty much a full water change, only had a few inches of water left.
but I will do a 25% water change tomorrow.
25-50% would be the amount to change at once. Every couple days. At those levels, fish aren't likely to last too long and will be damaged if they do. If you can get a water conditioner called "Prime" or "Amquel+", those can help protect the fish somewhat from the ammonia, nitrite and nitrates.
any idea of where I could get some from?
All the fish look fine, not signs of them getting affected. No heavy breathing or gasping for air.
What signs should I look out for?
Some pictures of the lil pleco
And one of my male guppies
Now going to put in the mopanI pieces.
Here's what the tank looks like with the mopanI wood in.
You might post a thread in the general forum to get input from other members in the UK on where to find Prime or Amquel+ there. You could also order online from websites like: