As far as I'm concern never use systemic fungicide as they can inhibit the germination of some seeds but if you want to try that is a good idea...try and error.Frankly speaking if you use autoclave at 15 to 20 psi for 15 to 20 minutes we dont have any problem with fungal infections but the problem arise when you want to sow them without laminar flow success rate very low but still have another technique to improve.
For the fertilizer you can take one tea spoon or one gram add into one liter the best always choose that contain a lots of micro elements. .