I've a well planted, cycled tank. A mix of tetras, female bettas and ottos. I added ferts capsules and its caused a huge nitrate spike. I've carried out water changes and removed the capsules but cannot get the levels below 80ppm.
I know levels should be below 40ppm but is there allowance for the ferts?
I've not used the capsules before but tried them for some of my thick rooted plants.
I also dose Flourish excell and neutro T, which I was told to do in addition.