Having deficiencys through out tank what I'm I missing?
My water parameters are: ph 8.4, ammonia 0, nitrite 0, nitrate is really high though its like 40 ppm
I was starting to think my plants had a potassium deficiency because a few of them got pinholes. But others just got dieing spots in the middle of the leafs that turned into the whole tip of the leaf turning brown ( this all happening on old growth) so I thought that could either be nitrogen deficiency or phosphate deficiency, I dose with flourish and I calculated out that in that dose I'm getting 0.07 potassium, 0.0011 phosphorus, and 0.02 nitrogen. I have been trying to do without water changes till like every six months and then redose with flourish. I currently haven't got to the next water change and redose. So what I'm I doing wrong? ill take all suggestions