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I have a 160l tank for tropical , I have taken a test could someone just clarify that the test is ok , thank you

I managed to take this picture while one of my tetras were staying still for once. I then cropped it and added a black background. Here it is: http://s1359.photobucket.com/user/TallTree01/media/Neon%20tetras%20and%20Spike/rsz_img_4326_zps34006975.jpg.html?sort=3&o=3