Cheers guys. Its a potting mix for seedlings which i think has condensed over time and suffocated the roots. Transferred today into a mix of perlite and another medium and gave a few sprays of a diluted nutrient mix
Seedlings about 3-4 weeks old, within the last week the bottom leaves have turned really yellow and dots have showed up on the other higher up leaves. Thought i was over-watering but drying it up hasn't seemed to help at all. Any suggestions ??