if you are using a peat mixture you must use dolimitic lime to keep the ph from being too low. peat is naturally acidic. i use promix bx myself, which is peat based and when i mix up a batch of soil i add 2 tbsp of lime per gal of soil. the 1st time i used promix i didn't add lime and i lost 7 outta 10 seedlings! also that seedling looks way too young to be getting ferts.