Hi Mick,
I’m not a scientist but E. Britannica gives this definition: “Damping-off is caused by a number of seed- and soil-borne fungi and funguslike oomycetes”. Anyway, I am not sure what exactly causes the low/no germination rate but the fungus is very visible. Therefore I was betting on it.
I use my own hot compost from last year as well which seemed perfectly ripe to me. The coconut fibre was new, so was perlite. No, I did not use wooded trays, I got plastic ones.
I started the seeds as usually indoors with floor heating on.
But again, watching Charles in his videos paying little to none attention to the cleanliness of his trays and to the compost composition per se, and getting the perfect germination causes headaches to me. I never had such a miserable germination before. Could the coconut fibre be possibly infected?
Pavol