I find coir bit difficult medium..its either too wet or if allowed to dry..its difficult to moisten up again...and its kind of 'fluffy' stuff that doesn't give good contact to seeds. If/when I use coir I add some sand to help with drainage, to give it bit more 'weight (for better contant) and help with drainage issues..and some fertilizer by using either BFB meal, John Innes Base fertilizer or failing that I don't have either one mentioned handy...little addition multipurpose compost that already have all the basic 'things' in, little compost would provide enough to get seeds started. When using coir with small plants..you will need touch of lime for the mixture too or the plants will struggle to take up any nutrients that you've provided.
