I agree that your test kit is probably off. There is a very slight possibility that your tank could start producing no3
into your 2nd week but a 200 ppm
reading is extremely high.
Nitrate test kits are notorious for being off if older then a year and usually give inaccurate readings that are very high. Even if you just bought the kit it could have been sitting on a shelf somewhere for over a year. Iâ€™d verify your results with the lfs
and also buy a new kit from a different manufacture to be sure.
As Devilishturtles said multiple pwc
of 50+% is the only way to reduce such high no3
numbers if they are accurate. Make sure you aerate and mix your SW
for 24+ hours before changing though.
What was the highest nh3
reading you have had so far and what is it currently?