Fish dying on waterchanges
I builded a planted tank four months ago, 80 liters heavily planted, EI dosing and CO2 inject. I waited 3 months to add the fishes.
Since Im doing EI dosing, I do a 50% water change on saturdays. As I was afraid the fish would suffer, After I get out the water, I refill it very slowly. Taking about two hours to get the tank full.
But after every water change my Cardinal Tetras start acting weird and next morning they are dead.
I had 30 cardinal tetra, all of them died along 3 weeks. Right after my water changes.
What am I doing wrong? is EI dosing incompatible with more delicated fishes?
Thank u all.