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I had added tetracycline to my frshwater fish tank when i noticed my largets 5 inch parrot fish was gasping for air(he later died) to my 70 gallon tank. I had added the first dosage and it turned the water an orange color I did a water change 25 percent and disconnected the carbon filter. He died not too long later. I did another water change 30 percent yesterday. I made a new sump filter with carbon bags bio balls ceramic rings etc so the filter is new but my trouble is my water is still an orange color how can i receive this orange tint out of my tank.It seems like when i add the chemicals it changes the color to orange