Wondering If I've Given My Leeks A Poor Start!??

I sowed my Leek seeds today (cat litter tray method!) and instead of sowing them in ordinary compost as I did last year, I used sowing and cutting compost. I am wondering as they stay in it for such a long time, was this a good move nutrition wise? Or should I feed later to make up for it?? Thanks

Excellent! Thank you again MOS.