Thanks for everyone’s reply’s, brain getting a bit fried on what to do. I have just checked and if you count putting seeds in water at very start today is day 75 (this is how long they are meant to take) this is why I thought the browning was the plant coming to the end of its life. I hear what you are saying about salt build up but as I was 50% soil and the pots were still heavy and felt damp on day 4 after water I had to extend to a 5th day between watering.