Just over a week ago, Mr. O'Farrell came to our classroom to test the water in our fish tank. He used a special testing kit to show us how much amonia was in the water. Unfortunately it turned out that the water wasn't in great condition! The picture below shows this (the darker the green, the worse the water).
So, on the advice of Mr. O'Farrell, we set about improving this. We, well Robbie, changed some of the water every day and added small drops of a chemical that helps reduce the chlorine. On Friday, Mr. O'Farrell came back to test the water again and we saw a huge improvement (see below). Hopefully our fish are now a bit happier!