Like in my other plants, this has been subjected to one or two feeds, with water with a very high pH due to a faulty meter...oops :(
The leaves are showing symptoms of nutrient burn which could be due to the fact that the incorrect pH caused the nutrients to be absorbed incorrectly.
To try and correct I have been feeding with water at a pH of around 5.5, for around a week. The soil pH is now around 6.
Apart from the leaves, the growth of the plant is OK although it's slowed down (but this could be natural) The bud sites are starting to build and already starting to see some frost. Which is a good sign of this being 20%++ THC!