"LeighMo" wrote in message
...
Tank chemistry is pretty normal (detailed below), only change since I
introduced the CO2 is nitrate has dropped from 10-20 ppm to 0 ppm


That is not good. Plants won't do well if nitrate is 0.

Are you fertilizing at all? You might need to now, if you weren't before.
At
least iron, and possibly potassium.

And nitrate, of course!

Sorry, I forgot to mention I'm using Seachem Flourish weekly. The tank is
not heavily populated and I'm planning on adding fish - hopefully that'll
increase the Nitrate available to the plants.


Graham.