I notice 2 fish dead yesterday. I took them out of course did about 25% water change and cleaned out my Marine land canister filter as my nitrate and nitrite levels were high. The filter does need new stuff in it that should be here tomorrow. I got up this morning and lost 2 more fish. I did a 50% water change tested the water nitrate was a little high at about 5.0ppm, turned the canister filter back on, noticed I lost another fish this afternoon. I have done another about 25% water change but have left the filter off. Don’t know what to do to keep my remaining fish alive till the stuff for the filter comes in tomorrow but could the filter even be the cause of the fish die?