White Widow, don't kill me

After about a week, 'lil sprout has shot up to about 4.5" tall, but has not grown out the leaves much. She's still drinking filtered tap water, so I hope that the medium doesn't turn into limestone. Fortunately, she still fits under a large plastic cup because the Blewitberry is still hogging the grow tent, doing whatever it's doing. Added some more mycorhize and sugar and did another 1L top water to get it soaked in.