Are those the new pots in the pictures? If so, seems to me like you are going to be wanting to transplant them again in a week or so.
I'm with FDD on this, they look fine to me and you really need to put some more soil in those pots. They still could be a little stressed from the x-plant or just a little soggy from the new water. On your next watering, add some Super Thrive to the water and continue to add it to your water for the next 4 weeks or so. Thats about the only thing you should consider adding to your water the first few weeks of growth.
The description for the PH stuff you have says its for aquariums, so you could use it. It also removes chlorine, so no need to have your tap water sit out over night. Use the ph7.0 stuff to assure your water ph is neutral. You should be more concerned about how you will test the ph of your soil. This needs to remain between a ph of 6.0-7.0. Consider investing into a decent soil ph tester if this is anything more than a fun little 'what if' project, but even those cheap rods you can find at most garden centers will do and are better than nothing at all.
Good luck