hi
Everything your adding to the plants is organic you don’t need to ph organic grows
Throw the ph meter and solution in a draw and forget about them or sell them you don’t want not need them not with organics
The light well 100w will suffice for now as your not even in veg yet the first 2-3 weeks is still seedling stage
Once you get into veg it will still do however for flowering nah it’s not enough. For one plant it still not really enough to get a good yeild from a 150w would cover one however for two you really want a 250w
Now am not saying it won’t work I’m simply saying to get a decent yeild you would need more than 100-150w in flower to cover both plants properly.
The humidity your running is way to high I know there seedlings however it’s still to high above 70% and you promote fungi growth. You need to get it down to around 50-60%
I see it’s a small tent I know there a pita to keep at the right temp / humidity it may look big now with two seedlings in it however once they grow up they will easily fill the tent.
Hope you enjoy the adventure and end up enjoying your first own grown harvest
Oh btw stop misting the plants leaves if you do it to much it leaches the plants food and don’t feed for a few weeks till they get older there’s enough food in the soil for seedlings if you feed now you risk stunting the plants