hi all I have not been on for sometime but I really need some help here. I'm very worried my fish are going to die as for all my efforts my water chemistry is getting worse rather than better. About a week ago I tested my water and my ammonia measured around 2 and appears to be rising. My nitrate is 20. My nitrite .25. My ph is 6. I have been water changing everyday and the ammonia is not improving. The nitrite was not .25 until tonight's read. So even though I have been changing the water the situation appears to be worse not better. Tank is now also a touch cloudier. I have a 90 litre tank with 10cardinal tetras and 2 Angel fish. They all appear ok at the moment. I have a nitrate sponge in the filter. I added 5 ml of prime last night. I'm also adding filtered water rather than tap. PLEASE HELP