This is our first grow in our new apartment...we're going to try and not kill our plant this time! We're about a week in today. We are using distilled water with a few drops of H2O2 and added 1mL of nutes for the first time yesterday. The pH has been great so far. The plant is getting very tall, but the leaves are still pretty tiny.
You should probably move your light a bit closer. It seems as though you're getting quite a bit of stretch.