No worry, my tank is 5 years old, I did a tank move from a 30 to a 90 4 years ago, so about 50% of my rock is 5, the rest 4. My nitrates range from 0 to .2 (Salifert), phosphates are within error margin of 0 on Hanna. I also do 1% daily water changes on a fixed schedule (fully automated). I dose...