What's your air circulation like ?
What's your lowest temps?
Any water lying around bottom of pots?
Checked underside of leaves for bugs?
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Hi sorry for such a late reply I’ve been busy with the kids the last week.
Air circulation should be fine unless to much is bad for it, the plant is going to be a mother plant and is in a 60cmL x 60cmH x 40cmD clone tent,
Why I build a new cupboard for it. Anyway the fan I’m using for the exhaust is a Blauberg 6” mixed flow 330cfm and then I have a Small oscillating fan in there aswell.
Temp could of been the problem I noticed the other day before the light came on it was down to 15c so I’ve added a small heater on a thermostat to correct that.
No water laying in the glass pot you see it sitting on that’s just there for when I water I come back and hour after watering and tip out what ever drained out the pot.
Checked for bugs tonight couldn’t see any.
I stopped feeding it mutes for a few days and just gave it rain water and it now seems to be doing well again no spots or damage to the new growth
and the old spots haven’t gotten any worse, so it was either the nurse or temp that was causing the problem.