:oops:im growing in soil also and if i got a 8 weeker for instance..i give it 60 days feed, 3-4 just ph' water, thats enough flush, normal watering... sorry wake and bake
i wouldnt use any kind of foil . better to use a white paper plate if any. the foil will unevenly deflect the light, maybe creating hot spots, and burnt leaves. stress!!.
just my thoughts