What Soil to start seedlings?

[bny806]

Hello! I am new to all of this... I started with seeds a month or so ago, warming mats, grow lights etc.. but I think I over watered, as My tomato plants started looking bad (I will try to attach a pic). .. Anyhow, I used miracle grow seed starting potting soil for most of them, and used the organic miracle grow one for others - the organic one must have had larvae in it, as these tiny white/purplish gnat looking things were ll over the soil! They eventually went away - but I don't know if they contributed to the damage...

So, I am starting my tomatoes over - so sad to have lost all that hard work!!! Is the miracle grow a bad mix to use? I am afraid my tomatos have a fungus, so I do want quality mix to start these new ones .. THanks for any advice!

(if anyone can tell me what my tomatoes look like on the attached pic - Virus, fungus? or just plain over watering?, I'd appreciate it! I don't want to make the same mistake with this new batch)!!!